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Interest Rate Swap Agreements (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Derivative [Line Items]          
Amount of Loss Recognized in Other Comprehensive Income/(Loss) on Derivative (Effective Portion) (Pre-Tax) $ 226 $ 904 $ 1,043 $ 1,401  
Other accrued liabilities | Interest rate swaps, Current          
Derivative [Line Items]          
Fair Value 1,802   1,802    
Other long-term liabilities | Interest rate swaps, Current          
Derivative [Line Items]          
Fair Value $ 1,983   $ 1,983   $ 2,742