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Operating Real Estate - Gain on Consolidation of Unconsolidated Venture (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 01, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]        
Investment in unconsolidated venture   $ (360,534) $ (534,541)  
Gain on consolidation of unconsolidated venture   6,408 0 $ 0
Winterfell Portfolio        
Business Acquisition [Line Items]        
Contract purchase price $ 894,157      
Net consideration funded at closing, excluding consideration financed by debt (142,941)      
Debt assumed (648,211) $ (648,211)    
Fair value of retained equity interest 103,005      
Investment in unconsolidated venture (96,597)   $ (95,700)  
Gain on consolidation of unconsolidated venture $ 6,408