Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance, at Dec. 31, 2009	$ 111	$ 47,660	$ 212,787	$ (27,574)	$ (392)	$ 232,592
Net income			20,492			20,492
Other comprehensive income net of tax:
Pension liability adjustments (Net of tax: $356, $1,255, $34)					(74)	(74)
Reclassification of unrealized derivative loss on cash flow hedges to earnings (Net of tax: $0, $0, ($7))					11	11
Foreign currency translation adjustment					117	117
Reclassification of market value adjustments for investments to earnings (Net of tax: $0, $0, $510)					(730)	(730)
Purchase of Common shares for Treasury				(17)		(17)
Issuance of Common shares, net of forfeitures		(374)		3,730		3,356
Balance, at Dec. 31, 2010	111	47,286	233,279	(23,861)	(1,068)	255,747
Net income			22,895			22,895
Other comprehensive income net of tax:
Pension liability adjustments (Net of tax: $356, $1,255, $34)					(2,254)	(2,254)
Foreign currency translation adjustment					(1,306)	(1,306)
Purchase of Common shares for Treasury				(6,480)		(6,480)
Issuance of Common shares, net of forfeitures		63		2,172		2,235
Cash dividends on common stock paid to shareholders			(1,022)			(1,022)
Balance, at Dec. 31, 2011	111	47,349	255,152	(28,169)	(4,628)	269,815
Net income			16,188			16,188
Other comprehensive income net of tax:
Pension liability adjustments (Net of tax: $356, $1,255, $34)					(765)	(765)
Foreign currency translation adjustment					1,724	1,724
Issuance of Common shares, net of forfeitures		(1,059)		2,701		1,642
Cash dividends on common stock paid to shareholders			(1,029)			(1,029)
Balance, at Dec. 31, 2012	$ 111	$ 46,290	$ 270,311	$ (25,468)	$ (3,669)	$ 287,575