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Interest Rate Swap Agreements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Derivative [Line Items]
Amount of Loss/(Gain) Recognized in Other Comprehensive Income on Derivative (Effective Portion) (Pre-Tax)	$ (459)	$ 226	$ (666)	$ 1,043
Reclassification out of Accumulated Other Comprehensive Income
Derivative [Line Items]
Amount Recognized in Interest Expense (Pre-Tax)		$ 0		$ 0
Interest Rate Swap \| Fair Value, Measurements, Recurring \| Level 2 \| Other Accrued Liabilities
Derivative [Line Items]
Interest rate swaps, Current	2,391		2,391		$ 2,375
Interest Rate Swap \| Fair Value, Measurements, Recurring \| Level 2 \| Other long-term liabilities
Derivative [Line Items]
Interest rate swaps, Long-term	$ 550		$ 550		$ 1,232