Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Treasury Stock	Stock Trusts	Accumulated Other Comprehensive Income (loss)	Other
Balance at Dec. 31, 2011	$ 88,805	$ 270	$ 115,895	$ 83,479	$ (47,320)	$ (55,083)	$ (8,230)	$ (206)
Balance, shares at Dec. 31, 2011		27,018,000			8,541,000	3,363,000
Employee Stock Purchase Plan share issuance	294		181		113
Employee Stock Purchase Plan share issuance, shares					(19,000)
Stock Option Plan share issuance, net	223		(1,310)		1,533
Stock Option Plan share issuance, shares					(476,000)
Excess tax benefits from equity-based compensation	2,615		2,615
Restricted stock plan share issuance/forfeiture	(824)		(660)		(164)
Restricted stock plan share issuance/forfeiture, shares					(70,000)
Deferred compensation plan share issuance	308		226		127			45
Deferred compensation plan share issuance, shares					(26,000)
Purchase of stock	(4,591)				(4,591)
Purchase of stock, shares					326,000
Equity-based compensation	2,236		2,236
Net Income	16,165			16,165
Foreign currency adjustment	370						370
Pension loss adjustment, net of tax	(2,820)						(2,820)
Balance at Dec. 31, 2012	102,781	270	119,183	99,644	(50,302)	(55,083)	(10,680)	(251)
Balance, shares at Dec. 31, 2012		27,018,000			8,276,000	3,363,000
Employee Stock Purchase Plan share issuance	368		248		120
Employee Stock Purchase Plan share issuance, shares					(19,000)
Stock Option Plan share issuance, net	504		(183)		687
Stock Option Plan share issuance, shares					(110,000)
Excess tax benefits from equity-based compensation	1,119		1,119
Restricted stock plan share issuance/forfeiture	(931)		(567)		(364)
Restricted stock plan share issuance/forfeiture, shares					(52,000)
Deferred compensation plan share issuance	89		84		39			(34)
Deferred compensation plan share issuance, shares					(6,000)
Purchase of stock	(7,343)				(7,343)
Purchase of stock, shares					399,000
Equity-based compensation	2,647		2,647
Net Income	15,679			15,679
Dividends declared	(3,046)			(3,046)
Foreign currency adjustment	717						717
Pension loss adjustment, net of tax	1,258						1,258
Balance at Dec. 31, 2013	113,842	270	122,531	112,277	(57,163)	(55,083)	(8,705)	(285)
Balance, shares at Dec. 31, 2013	27,017,824	27,018,000			8,488,000	3,363,000
Employee Stock Purchase Plan share issuance	323		145		178
Employee Stock Purchase Plan share issuance, shares					(24,000)
Stock Option Plan share issuance, net	974		(2,082)		3,056
Stock Option Plan share issuance, shares					(513,000)
Excess tax benefits from equity-based compensation	1,964		1,964
Restricted stock plan share issuance/forfeiture	(2,745)		(247)		(2,498)
Restricted stock plan share issuance/forfeiture, shares					84,000
Deferred compensation plan share issuance	1,118		485		348			285
Deferred compensation plan share issuance, shares					(48,000)
Purchase of stock	(7,432)				(7,432)
Purchase of stock, shares					499,000
Equity-based compensation	3,088		3,088
Net Income	10,350			10,350
Dividends declared	(3,628)			(3,628)
Foreign currency adjustment	(2,274)						(2,274)
Pension loss adjustment, net of tax	(4,614)						(4,614)
Balance at Dec. 31, 2014	$ 110,966	$ 270	$ 125,884	$ 118,999	$ (63,511)	$ (55,083)	$ (15,593)
Balance, shares at Dec. 31, 2014	27,017,824	27,018,000			8,486,000	3,363,000