Fair Value Measurements - Narratives (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Equity in earnings of equity method investments in real estate $ 3,262,000 $ 14,667,000 $ 24,073,000
Deferred financing cost 9,491,000    
Impairment charges 29,706,000 1,023,000 570,000
Goodwill impairment 0    
Shelborne Property Associates, LLC | Third Party | All Other      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Goodwill impairment $ 22,800,000    
Cash flows discount rate 8.00%    
Discount rate 8.00%    
Cap rate 6.80%    
Nonrecurring | Level 3      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Impairment charges $ 31,625,000 1,023,000 1,336,000
Equity investments in real estate | Nonrecurring | Level 3      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Impairment charges $ 1,919,000 0 $ 766,000
Cash flows discount rate 8.75%   11.80%
Discount rate 7.75%   10.50%
Cap rate 6.75%   9.50%
ASU 2015-03 | Non recourse debt and accounts payable      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Deferred financing cost   12,800,000  
ASU 2015-03 | Non recourse debt      
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]      
Deferred financing cost $ 9,300,000 $ 12,500,000