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Indebtedness Secured Debt (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
loans
Sep. 30, 2014
USD ($)
Debt Instrument [Line Items]        
Repayments of Secured Debt     $ 221,085 $ 93,036
Gains (Losses) on Extinguishment of Debt $ 64 $ 0 $ (82,589) $ (139)
Fixed Rate Secured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum     2.20%  
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum     3.60%  
Number of secured loans repaid | loans     16  
Repayments of Secured Debt     $ 208,900  
Repaid Debt, Weighted Average Interest Rate 5.36%   5.36%  
Secured Debt [Member]        
Debt Instrument [Line Items]        
Gains (Losses) on Extinguishment of Debt $ 3,700