CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 13,540	$ 10,902	$ 27,167	$ 25,482
Foreign currency translation adjustment	8,731	(1,403)	(19,250)	(1,730)
Derivative instruments designated as cash flow hedges:
Unrealized gain (loss) on derivative instruments held at period end, net of tax (Note 6)	(160)	13	(160)	(167)
Unrealized gain (loss) reclassified into earnings	(124)	(1)	94	209
Pension and postretirement benefit plans reclassified into earnings, net of tax (Note 6)
Amortization of loss	262	124	531	263
Other comprehensive income (loss)	8,709	(1,267)	(18,785)	(1,425)
Comprehensive income (loss)	$ 22,249	$ 9,635	$ 8,382	$ 24,057