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Investments in Real Estate and Real Estate Under Construction - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Property
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]          
Aggregate acquisition expenses     $ 488 $ 214  
Construction in progress $ 29,442   29,442   $ 106,652
Proceeds from sale of real estate     148,960 131,985  
Debt satisfaction charges, net 46 $ 3,194 46 3,356  
Asset impairment charges 13,599 3,014 21,591 3,014  
LCIF [Member]          
Business Acquisition [Line Items]          
Construction in progress 0   0   40,443
Proceeds from sale of real estate     7,106 69,038  
Impairment of real estate     5,259    
Debt satisfaction charges, net 0 1,615 0 1,615  
Asset impairment charges $ 2,762 $ 2,426 $ 5,259 2,426  
Certain Properties [Member] | LCIF [Member]          
Business Acquisition [Line Items]          
Number of properties sold | Property     2    
Proceeds from sale of real estate     $ 7,591 103,265  
Gain on sale of properties       16,029  
Debt satisfaction charges, net       $ 1,615  
Development Deals [Member]          
Business Acquisition [Line Items]          
Capitalized interest     $ 458   $ 3,442