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Investments in Real Estate Partnerships - Investment Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]    
Document Fiscal Year Focus 2015  
Capital - Regency $ 414,681 $ 442,050
less: Impairment of investment in real estate partnerships 1,300 1,300
less: Ownership percentage or Restricted Gain Method deferral 28,972 29,380
less: Net book equity in excess of purchase price 78,203 78,203
Investments in real estate partnerships $ 306,206 $ 333,167
Indian Springs [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00%  
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain $ 18,300