Consolidated Statements Of Shareholders' Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total
Balance, value at Dec. 31, 2010	$ 305	$ 231,999	$ 212,914	$ (2,060)	$ (2,305)	$ 440,853
Balance, shares at Dec. 31, 2010	30,516,000				219,000
Net (loss) income			16,523			16,523
Foreign currency translation adjustment				(1,232)		(1,232)
Adjustment to retirement benefit liability, net of taxes				(187)		(187)
Adjustment to post-retirement healthcare benefit liability, net of taxes				129		129
Stock compensation expense		4,642				4,642
Net settlement of restricted stock units, shares	177,000				62,000
Net settlement of restricted stock units, value	2	(2)			(826)	(826)
Issuance of restricted stock, shares	6,000
Stock options exercised, shares	3,000					3,375
Stock options exercised, value		34				34
Balance, value at Dec. 31, 2011	307	236,673	229,437	(3,350)	(3,131)	459,936
Balance, shares at Dec. 31, 2011	30,702,000				281,000
Net (loss) income			12,645			12,645
Foreign currency translation adjustment				2,353		2,353
Adjustment to retirement benefit liability, net of taxes				(79)		(79)
Adjustment to post-retirement healthcare benefit liability, net of taxes				(499)		(499)
Stock compensation expense		3,148				3,148
Excess tax benefit from compensation		10				10
Net settlement of restricted stock units, shares	197,000				69,000
Net settlement of restricted stock units, value	2	(2)			(970)	(970)
Issuance of restricted stock, shares	11,000
Stock options exercised, shares	28,000					27,500
Stock options exercised, value		278				278
Balance, value at Dec. 31, 2012	309	240,107	242,082	(1,575)	(4,101)	476,822
Balance, shares at Dec. 31, 2012	30,938,000				350,000
Net (loss) income			(5,633)			(5,633)
Foreign currency translation adjustment				(2,108)		(2,108)
Adjustment to retirement benefit liability, net of taxes				53		53
Adjustment to post-retirement healthcare benefit liability, net of taxes				45		45
Stock compensation expense		2,564				2,564
Excess tax benefit from compensation		72				72
Net settlement of restricted stock units, shares	120,000				45,000
Net settlement of restricted stock units, value	2	(2)			(714)	(714)
Issuance of restricted stock, shares	13,000
Stock options exercised, shares	60,000					59,750
Stock options exercised, value		648				648
Balance, value at Dec. 31, 2013	$ 311	$ 243,389	$ 236,449	$ (3,585)	$ (4,815)	$ 471,749
Balance, shares at Dec. 31, 2013	31,131,000				395,000