CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 12,455	$ 20,388	$ 39,621	$ 45,870
Foreign currency translation adjustment	(2,067)	(23,692)	(21,317)	(25,421)
Derivative instruments designated as cash flow hedges:
Unrealized gain (loss) on derivative instruments held at period end, net of tax (Note 6)	(19)	53	(179)	(115)
Unrealized gain (loss) reclassified into earnings	(1)	(77)	93	210
Pension and postretirement benefit plans reclassified into earnings, net of tax (Note 6):
Amortization of loss	277	132	808	395
Other comprehensive income (loss)	(1,810)	(23,584)	(20,595)	(24,931)
Comprehensive income (loss)	$ 10,645	$ (3,196)	$ 19,026	$ 20,939