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Fair Value Measurements (Details 2) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]        
Fair Value $ (235,214) $ (269,815) $ (279,971) $ (284,580)
Fair value adjustment to borrowings subject to TROR [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]        
Fair Value 2,305 $ 5,604 $ 6,590 $ 8,869
Potential Future Exposure [Member] | Fair value measurement, recurring basis [Member] | Credit valuation adjustment of interest rate swap [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]        
Fair Value $ 2,276      
Credit Spread 4.00%      
Bond Valuation [Member] | Fair value measurement, recurring basis [Member] | TROR [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]        
Fair Value $ (11,070)      
Bond Valuation [Member] | Fair value measurement, recurring basis [Member] | Fair value adjustment to borrowings subject to TROR [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]        
Fair Value $ 2,305      
Bond Valuation [Member] | Minimum [Member] | Fair value measurement, recurring basis [Member] | TROR [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]        
Bond Valuation $ 79.59      
Bond Valuation [Member] | Minimum [Member] | Fair value measurement, recurring basis [Member] | Fair value adjustment to borrowings subject to TROR [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]        
Bond Valuation 79.59      
Bond Valuation [Member] | Maximum [Member] | Fair value measurement, recurring basis [Member] | TROR [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]        
Bond Valuation 115.87      
Bond Valuation [Member] | Maximum [Member] | Fair value measurement, recurring basis [Member] | Fair value adjustment to borrowings subject to TROR [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]        
Bond Valuation $ 115.87