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Schedule III - Real Estate and Accumulated Depreciation (Details) (Textuals) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Real Estate and Accumulated Depreciation [Line Items]      
Secured debt (Notes 3, 6, 7 and 16) $ 381,918   $ 546,292
Debt premium   $ 6,200  
Aggregate cost of property for federal income tax purposes   $ 5,500,000  
Secured Debt [Member]      
Real Estate and Accumulated Depreciation [Line Items]      
Debt premium $ 6,200    
Building [Member]      
Real Estate and Accumulated Depreciation [Line Items]      
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years    
Tenant Improvements [Member] | Minimum [Member]      
Real Estate and Accumulated Depreciation [Line Items]      
Property, Plant and Equipment, Useful Life 1 year    
Tenant Improvements [Member] | Maximum [Member]      
Real Estate and Accumulated Depreciation [Line Items]      
Property, Plant and Equipment, Useful Life 20 years