Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Comprehensive Income (Loss) [Abstract]
Net income	$ 8,873	$ 1,972	$ 22,646	$ 20,853
Pension liability, net of income tax	510	237	1,529	776
Pension liability, tax	298	138	896	454
Cash flow hedging gain (loss), net of income tax	(361)	3,566	(956)	3,763
Cash flow hedging gain (loss), tax	(212)	2,090	(560)	2,205
Foreign currency translation adjustment	(5,281)	(9,948)	(14,563)	(8,391)
Comprehensive income (loss)	$ 3,741	$ (4,173)	$ 8,656	$ 17,001