Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Comprehensive Income (Loss) [Abstract]
Net income	$ 7,461	$ 10,255	$ 13,773	$ 18,881
Pension liability, net of income tax	507	269	1,019	539
Pension liability, tax	297	158	598	316
Cash flow hedging gain (loss), net of income tax	(2,557)	(528)	(595)	197
Cash flow hedging gain (loss), tax	(1,499)	(309)	(349)	115
Foreign currency translation adjustment	3,219	1,601	(9,282)	1,557
Comprehensive income	$ 8,630	$ 11,597	$ 4,915	$ 21,174