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Indebtedness Secured Debt (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
loans
Jun. 30, 2014
USD ($)
Debt Instrument [Line Items]        
Repayments of Secured Debt     $ 207,169 $ 88,898
Gains (Losses) on Extinguishment of Debt $ (82,653) $ (139) $ (82,653) $ (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     3.70%  
Number of secured loans repaid | loans     15  
Repayments of Secured Debt     $ 197,600  
Repaid Debt, Weighted Average Interest Rate 5.32%   5.32%  
Secured Debt [Member]        
Debt Instrument [Line Items]        
Gains (Losses) on Extinguishment of Debt $ 3,800