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Fair Value Measurements (Details 2) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]        
Fair Value $ (243,741) $ (269,815) $ (295,887) $ (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 3,153 $ 5,604 $ 6,658 $ 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 $ 2,704      
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 $ (10,775)      
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 $ 3,153      
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 114.21      
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 $ 114.21