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Commitments and Contingencies - Income Taxes (Details) (U.S. Virgin Island, Foreign Tax Authority [Member])
3 Months Ended
Mar. 31, 2015
U.S. Virgin Island | Foreign Tax Authority [Member]
 
Income Tax Contingency [Line Items]  
Income tax agreement raate 7.00%drh_IncomeTaxAgreementIncomeTaxRate
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_IncomeTaxAuthorityNameAxis
= country_VI
Statutory tax rate 37.40%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_IncomeTaxAuthorityNameAxis
= country_VI