Consolidated Statements Of Shareholders' Equity (USD $) In Thousands	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				219
Net income			23,128			23,128
Foreign currency translation adjustment				(1,451)		(1,451)
Adjustment to pension benefit liability, net of taxes of $59				(93)		(93)
Adjustment to post-retirement healthcare benefit liability, net of taxes of $35				57		57
Stock compensation expense		3,895				3,895
Net settlement of restricted stock units, value	2	(2)			(826)	(826)
Net settlement of restricted stock units, shares	177				62
Issuance of restricted stock	6
Stock options exercised, shares	1
Stock options exercised, value		10				10
Balance, value at Sep. 30, 2011	$ 307	$ 235,902	$ 236,042	$ (3,547)	$ (3,131)	$ 465,573
Balance, shares at Sep. 30, 2011	30,700				281