Consolidated Statements Of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Total
Balance, at Dec. 31, 2013	$ 111	$ 47,239	$ 298,361	$ (24,731)	$ (4,583)	$ 316,397
Net (loss) income			25,656			25,656
Other comprehensive loss, net of tax:
Pension liability adjustment					(2,446)	(2,446)
Foreign currency translation adjustment					(4,863)	(4,863)
Unrealized derivative loss on cash flow hedges						0
Issuance of common shares, net of shares withheld for taxes		(2,467)		1,613		(854)
Stock based compensation and related excess tax benefit/deficiency		3,343				3,343
Cash dividends on common stock paid to shareholders			(1,345)			(1,345)
Balance, at Dec. 31, 2014	111	48,115	322,672	(23,118)	(11,892)	335,888
Net (loss) income			(44,445)			(44,445)
Other comprehensive loss, net of tax:
Pension liability adjustment					1,020	1,020
Foreign currency translation adjustment					(6,947)	(6,947)
Unrealized derivative loss on cash flow hedges					(121)	(121)
Purchase of common shares for treasury				(1,587)		(1,587)
Issuance of common shares, net of shares withheld for taxes		(3,158)		2,114		(1,044)
Stock based compensation and related excess tax benefit/deficiency		1,724				1,724
Cash dividends on common stock paid to shareholders			(1,656)			(1,656)
Balance, at Dec. 31, 2015	111	46,681	276,571	(22,591)	(17,940)	282,832
Net (loss) income			(141,660)			(141,660)
Other comprehensive loss, net of tax:
Pension liability adjustment					(1,370)	(1,370)
Foreign currency translation adjustment					(5,896)	(5,896)
Unrealized derivative loss on cash flow hedges					(83)	(83)
Purchase of common shares for treasury				(67)		(67)
Issuance of common shares, net of shares withheld for taxes		(3,597)		3,322		(275)
Stock based compensation and related excess tax benefit/deficiency		1,014				1,014
Cash dividends on common stock paid to shareholders			(1,244)			(1,244)
Balance, at Dec. 31, 2016	$ 111	$ 44,098	$ 133,667	$ (19,336)	$ (25,289)	$ 133,251