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Schedule III - Real Estate and Accumulated Depreciation (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
property
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]      
Number of real estate assets held for sale | property 1    
Gross value of assets held for sale $ 19,400    
Accumulated depreciation on real estate assets held for sale 10,700    
Issuance costs 6,534    
Estimated aggregate total cost of total assets for federal income tax purposes $ 4,000,000 $ 4,000,000 $ 3,700,000
Minimum [Member] | Building and improvements [Member]      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]      
Asset estimated useful life 3 years 3 months 18 days    
Minimum [Member] | Lease intangibles [Member]      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]      
Asset estimated useful life 2 years 1 month 6 days    
Minimum [Member] | Personal Property [Member]      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]      
Asset estimated useful life 2 years 9 months 18 days    
Minimum [Member] | Land improvements [Member]      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]      
Asset estimated useful life 5 years    
Maximum [Member] | Building and improvements [Member]      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]      
Asset estimated useful life 39 years    
Maximum [Member] | Lease intangibles [Member]      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]      
Asset estimated useful life 99 years    
Maximum [Member] | Personal Property [Member]      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]      
Asset estimated useful life 20 years    
Maximum [Member] | Land improvements [Member]      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]      
Asset estimated useful life 39 years    
Mortgage Notes [Member]      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]      
Issuance costs $ 700    
Mortgage notes payable [Member] | Mortgage Notes [Member]      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]      
Unamortized premium 1,805 2,651  
Unaccreted discount 968 1,332  
Issuance costs $ 744 $ 853