CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Income from continuing operations, net of tax	$ 46,320	$ 53,412	$ 38,203
Foreign currency translation adjustments	(27,172)	(36,949)	10,171
Derivative instruments designated as cash flow hedges:
Unrealized gain (loss) on derivative instruments held at year end (net of taxes of $5 in 2015, $50 in 2014 and $110 in 2013)	(2)	(93)	(210)
Unrealized gain (loss) reclassified into earnings	84	209	236
Accumulated other comprehensive income (loss) pension and post-retirement benefits:
Actuarial net gain (loss) incurred in fiscal year	2,760	(20,715)	32,749
Amortization of gain (loss)	966	3,904	2,482
Amortization of prior service credit (cost)	0	0	930
Other comprehensive income (loss)	(23,364)	(53,644)	46,358
Comprehensive income (loss) from continuing operations	22,956	(232)	84,561
Income from discontinued operations, net of income taxes	0	0	102
Comprehensive income (loss)	$ 22,956	$ (232)	$ 84,663