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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS Fair Value by Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes receivable and preferred equity investments $ 147,188 $ 102,286 $ 126,656 $ 129,278
Mortgage, Convertible Notes and Other Notes Payable 1,358,606 1,118,602    
Estimated Fair Value [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Mortgage, Convertible Notes and Other Notes Payable 1,382,318 $ 1,141,371    
Carrying Amount [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Mortgage, Convertible Notes and Other Notes Payable $ 1,358,606