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Summary of Significant Accounting Policies - Components of other operating income (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Operating Income [Abstract]      
Property lease guaranty revenue $ 4,430hr_PropertyLeaseGuarantyRevenue $ 5,114hr_PropertyLeaseGuarantyRevenue $ 4,898hr_PropertyLeaseGuarantyRevenue
Interest income 731hr_InterestIncomeOnNotesReceivable 457hr_InterestIncomeOnNotesReceivable 448hr_InterestIncomeOnNotesReceivable
Management fee income 289us-gaap_PropertyManagementFeeRevenue 164us-gaap_PropertyManagementFeeRevenue 158us-gaap_PropertyManagementFeeRevenue
Other 215hr_OtherOperatingIncomeNotMentionedAnywhere 191hr_OtherOperatingIncomeNotMentionedAnywhere 548hr_OtherOperatingIncomeNotMentionedAnywhere
Other operating $ 5,665us-gaap_OtherRealEstateRevenue $ 5,926us-gaap_OtherRealEstateRevenue $ 6,052us-gaap_OtherRealEstateRevenue