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Non-Recourse Property Debt and Credit Agreement - (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Non-recourse property debt $ 3,846,160 $ 4,022,809
Fixed Rate    
Debt Instrument [Line Items]    
Non-recourse property debt 3,761,238 3,902,642
Variable Rate    
Debt Instrument [Line Items]    
Non-recourse property debt $ 84,922 $ 120,167