CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 27,032	$ 14,928
Foreign currency translation adjustment	4,138	10,926
Derivative instruments designated as cash flow hedges:
Unrealized gain (loss) on derivative instruments held at period end, net of tax (Note 6)	(114)	4
Unrealized gain (loss) reclassified into earnings (Note 6)	0	2
Pension and postretirement benefit plans reclassified into earnings, net of tax (Note 6):
Amortization of loss	30	35
Other comprehensive income (loss)	4,054	10,967
Comprehensive income (loss)	$ 31,086	$ 25,895