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        <TitleTxt>Board Member</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Walter A Koelbel Jr</PersonNm>
        <TitleTxt>Board Member</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>John M Levisay</PersonNm>
        <TitleTxt>Board Member</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>David L Liniger</PersonNm>
        <TitleTxt>Board Member</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Naresh Mandava MD</PersonNm>
        <TitleTxt>Board Member</TitleTxt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Christine Marquez-Hudson</PersonNm>
        <TitleTxt>Board Member</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Anne M McCarthy</PersonNm>
        <TitleTxt>Board Member</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Stephen G McConahey</PersonNm>
        <TitleTxt>Board Member</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Susan B McIntire</PersonNm>
        <TitleTxt>Board Member</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Kristin Richardson</PersonNm>
        <TitleTxt>Board Member</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Timothy M Ryan</PersonNm>
        <TitleTxt>Board Member</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Mark S Sexton</PersonNm>
        <TitleTxt>Board Member</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>M Ray Thomasson</PersonNm>
        <TitleTxt>Board Member</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Leo M Tilman</PersonNm>
        <TitleTxt>Board Member</TitleTxt>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Edward M Warner</PersonNm>
        <TitleTxt>Board Member</TitleTxt>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>George Sparks</PersonNm>
        <TitleTxt>President &amp; CEO</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Edward Scholz</PersonNm>
        <TitleTxt>Treasurer/VP Fin. &amp; Bus. O</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Mary Hacking</PersonNm>
        <TitleTxt>VP of Visitors</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Serena Bruzgo</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Gabriela Chavarria</PersonNm>
        <TitleTxt>VP of Research &amp; Collections</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Nancy Walsh</PersonNm>
        <TitleTxt>VP of Museum Partnerships</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Eric Boen</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Megan Fisher</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Ashley Alexander</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Tina Martinez</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Amanda Bennett</PersonNm>
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        <ContractorAddress>
          <USAddress>
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            <CityNm>Frederick</CityNm>
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      <ContractorCompensationGrp>
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          <USAddress>
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            <StateAbbreviationCd>OH</StateAbbreviationCd>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
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      <ContractorCompensationGrp>
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          <BusinessName>
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          <USAddress>
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            <StateAbbreviationCd>MA</StateAbbreviationCd>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>BCER Engineering Inc</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>5420 Ward Rd Suite 200</AddressLine1Txt>
            <CityNm>Arvada</CityNm>
            <StateAbbreviationCd>CO</StateAbbreviationCd>
            <ZIPCd>80002</ZIPCd>
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        <ExclusionAmt>153562</ExclusionAmt>
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        <Desc>Miscellaneous</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>111149</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>111149</RelatedOrExemptFuncIncomeAmt>
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        <RelatedOrExemptFuncIncomeAmt>25179362</RelatedOrExemptFuncIncomeAmt>
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        <ExclusionAmt>227628</ExclusionAmt>
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      <InfoInScheduleOPartIXInd>X</InfoInScheduleOPartIXInd>
      <GrantsToDomesticIndividualsGrp>
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        <ProgramServicesAmt>384158</ProgramServicesAmt>
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        <ProgramServicesAmt>540871</ProgramServicesAmt>
        <ManagementAndGeneralAmt>495222</ManagementAndGeneralAmt>
        <FundraisingAmt>333610</FundraisingAmt>
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        <ProgramServicesAmt>14590239</ProgramServicesAmt>
        <ManagementAndGeneralAmt>2055060</ManagementAndGeneralAmt>
        <FundraisingAmt>1296693</FundraisingAmt>
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      <PensionPlanContributionsGrp>
        <TotalAmt>717150</TotalAmt>
        <ProgramServicesAmt>591436</ProgramServicesAmt>
        <ManagementAndGeneralAmt>78318</ManagementAndGeneralAmt>
        <FundraisingAmt>47396</FundraisingAmt>
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        <TotalAmt>3668157</TotalAmt>
        <ProgramServicesAmt>2949629</ProgramServicesAmt>
        <ManagementAndGeneralAmt>459468</ManagementAndGeneralAmt>
        <FundraisingAmt>259060</FundraisingAmt>
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      <PayrollTaxesGrp>
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        <ProgramServicesAmt>1142091</ProgramServicesAmt>
        <ManagementAndGeneralAmt>187939</ManagementAndGeneralAmt>
        <FundraisingAmt>115655</FundraisingAmt>
      </PayrollTaxesGrp>
      <FeesForServicesLegalGrp>
        <TotalAmt>37788</TotalAmt>
        <ManagementAndGeneralAmt>37788</ManagementAndGeneralAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesLobbyingGrp>
        <TotalAmt>30000</TotalAmt>
        <ManagementAndGeneralAmt>30000</ManagementAndGeneralAmt>
      </FeesForServicesLobbyingGrp>
      <FeesForServicesProfFundraising>
        <TotalAmt>81326</TotalAmt>
        <FundraisingAmt>81326</FundraisingAmt>
      </FeesForServicesProfFundraising>
      <FeesForServicesOtherGrp>
        <TotalAmt>5402780</TotalAmt>
        <ProgramServicesAmt>4745490</ProgramServicesAmt>
        <ManagementAndGeneralAmt>471160</ManagementAndGeneralAmt>
        <FundraisingAmt>186130</FundraisingAmt>
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        <TotalAmt>1868386</TotalAmt>
        <ProgramServicesAmt>105227</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1672751</ManagementAndGeneralAmt>
        <FundraisingAmt>90408</FundraisingAmt>
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      <OfficeExpensesGrp>
        <TotalAmt>3907309</TotalAmt>
        <ProgramServicesAmt>2123639</ProgramServicesAmt>
        <ManagementAndGeneralAmt>968896</ManagementAndGeneralAmt>
        <FundraisingAmt>814774</FundraisingAmt>
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        <TotalAmt>4080508</TotalAmt>
        <ProgramServicesAmt>3580777</ProgramServicesAmt>
        <ManagementAndGeneralAmt>378040</ManagementAndGeneralAmt>
        <FundraisingAmt>121691</FundraisingAmt>
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        <FormAndLineReferenceDesc>Part I, Line 32b:</FormAndLineReferenceDesc>
        <ExplanationTxt>The Museum partners with Cars Helping Charities, that will collect a donated vehicle from the donor, sell it, and then forward the proceeds net of appropriate expenses to the Museum. Cars Helping Charities distributes the appropriate tax forms to the donor and the Museum. The Museum files the necessary paperwork with the IRS.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Part I, Line 33:</FormAndLineReferenceDesc>
        <ExplanationTxt>The Museum's collections, which were acquired through purchases, contributions, and active field collecting since the Museum's inception, are not recognized as assets on the statement of financial position. Purchases of collection items are recorded as decreases in unrestricted net assets in the year in which the items are acquired. Contributed collection items are not reflected on the financial statements. Proceeds from deaccessions or insurance recoveries are reflected as increases in the appropriate net asset classes. The Museum had 39 accessions of donated objects in 2018 with a combined estimated value in excess of $75,000.</ExplanationTxt>
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        <ExplanationTxt>The completed Form 990 is reviewed by the Audit and Finance Committee, and subsequently by the Governing Board of the Museum prior to submission to the Internal Revenue Service.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>Conflict of interest disclosures are completed yearly by trustees, officers, and key employees. Potential conflicts, whether initially disclosed or subsequently discovered, are reviewed by the Nominating and Governance Committee to determine if a conflict actually exists. The Nominating and Governance Committee provides a report of conflicts and Committee decisions to the Board yearly. Trustees, officers, or directors that may have a conflict are prohibited from participating at both the Committee and/or Board level in deliberations regarding any potential or actual conflict.</ExplanationTxt>
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        <ExplanationTxt>The Compensation Committee of the Board of Trustees is responsible for evaluating the performance, compensation, and benefits of the President/CEO as well as those in a position to exercise substantial influence over the affairs of the Museum, including the officers and senior administrative staff. The Compensation Committee solicits feedback annually from the Board of Trustees and senior staff regarding the President/CEO's performance. This feedback is reviewed and discussed by the Compensation Committee in conjunction with comparable salary data. After deliberation, the Committee's recommendations are presented to the Board of Trustees Chair who informs the President/CEO of compensation and benefits for the upcoming year. The Chair reports final salary decisions to the entire Board of Trustees at the next available board meeting. The President/CEO conducts, annually, a performance review of each member of the Senior Leadership Team. Using comparable salary data and compensation adjustment guidelines reviewed by the Board of Trustees, the President/CEO determines the compensation and benefits for each member of the Senior Leadership Team. The President/CEO then presents this information to the Compensation Committee for their review and approval. Minutes are kept for each meeting of the Compensation Committee.</ExplanationTxt>
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        <ExplanationTxt>Governing documents are publicly filed with the Secretary of State and are available on DMNS's website. The conflict of interest policy is also made available on the website. Financial Statements are published in DMNS's annual report and are available on the DMNS website.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Form 990, Part IX, line 11g</FormAndLineReferenceDesc>
        <ExplanationTxt>Audit: Program service expenses 0. Management and general expenses 55,600. Fundraising expenses 0. Total expenses 55,600. Professional services: Program service expenses 4,745,490. Management and general expenses 415,560. Fundraising expenses 186,130. Total expenses 5,347,180.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XII, line 2c</FormAndLineReferenceDesc>
        <ExplanationTxt>This process has not changed from the prior year.</ExplanationTxt>
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