Consolidated Statements of Shareholders' Equity (USD $) In Thousands, except Per Share data, unless otherwise specified	Total	Common stock at $1 par value		Capital in excess of par value	Reinvested earnings	Accumulated other comprehensive income (loss)	Employee benefit stock	Treasury stock
Balance at Dec. 31, 2009	$ 144,461	$ 21,210	[1]	$ 35,221	$ 135,225	$ (14,585)	$ (585)	$ (32,025)
Comprehensive income:
Net earnings	28,662				28,662
Other comprehensive income:
Employee benefit funded status adjustment, net of tax	1,730					1,730
Foreign currency translation adjustment	(282)					(282)
Comprehensive income	30,110
Cash dividends of $0.52, $0.60, $0.66 per share in 2010, 2011 and 2012 respectively	(7,786)				(7,786)
Stock options exercised	362	49	[1]	313
Tax benefit on stock options and dividends	525			525
ESSOP transactions	(792)			159			(951)
Stock-based compensation	967			967
Issuance of treasury stock (27,41,42 shares in 2010,2011 and 2012 respectively)	536			397				139
Balance at Dec. 31, 2010	168,383	21,259	[1]	37,582	156,101	(13,137)	(1,536)	(31,886)
Comprehensive income:
Net earnings	19,161				19,161
Other comprehensive income:
Employee benefit funded status adjustment, net of tax	(1,162)					(1,162)
Foreign currency translation adjustment	(267)					(267)
Comprehensive income	17,732
Cash dividends of $0.52, $0.60, $0.66 per share in 2010, 2011 and 2012 respectively	(8,991)				(8,991)
Stock options exercised	235	33	[1]	202
Tax benefit on stock options and dividends	190			190
ESSOP transactions	104			53			51
Stock-based compensation	1,134			1,134
Issuance of treasury stock (27,41,42 shares in 2010,2011 and 2012 respectively)	494			284				210
Common stock, par value (in dollars per share)	$ 1
Balance at Dec. 31, 2011	179,281	21,292	[1]	39,445	166,271	(14,566)	(1,485)	(31,676)
Comprehensive income:
Net earnings	28,032				28,032
Other comprehensive income:
Employee benefit funded status adjustment, net of tax	225					225
Foreign currency translation adjustment	393					393
Comprehensive income	28,650
Cash dividends of $0.52, $0.60, $0.66 per share in 2010, 2011 and 2012 respectively	(9,497)				(9,497)
Stock options exercised	382	37	[1]	345
Tax benefit on stock options and dividends	297			297
ESSOP transactions	392			141			251
Stock-based compensation	1,266			1,266
Shares purchased and retired	(30,000)	(888)			(29,112)
Issuance of treasury stock (27,41,42 shares in 2010,2011 and 2012 respectively)	476			261				215
Common stock, par value (in dollars per share)	$ 1
Balance at Dec. 31, 2012	$ 171,247	$ 20,441	[1]	$ 41,755	$ 155,694	$ (13,948)	$ (1,234)	$ (31,461)

[1] Each common share of stock equals $1 par value; therefore, the number of common shares is the same as the dollar value.