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, 2009	$ 303	$ 227,362	$ 303,982	$ (2,230)	$ (1,191)	$ 528,226
Balance, shares at Dec. 31, 2009	30,295,000				151,000
Net income (loss)			(91,068)			(91,068)
Foreign currency translation adjustment				(591)		(591)
Adjustment to retirement benefit liability, net of taxes				277		277
Adjustment to post-retirement healthcare benefit liability, net of taxes				(722)		(722)
Reclassification of unrealized loss on interest rate swap, net of tax				1,206		1,206
Stock compensation expense		4,315				4,315
Excess tax benefit from compensation		54				54
Net settlement of restricted stock units, shares	187,000				68,000
Net settlement of restricted stock units, value	2	(2)			(1,114)	(1,114)
Issuance of restricted stock, shares	6,000
Stock options exercised, shares	28,000					28,586
Stock options exercised, value		270				270
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 income (loss)			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
Reclassification of unrealized loss on interest rate swap, net of tax
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 income (loss)			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)
Reclassification of unrealized loss on interest rate swap, net of tax
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