Consolidated Statements of Shareholders' Equity (USD $) In Thousands, 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, 2008	$ 111,023	$ 21,074	[1]	$ 31,563	$ 107,887	$ (16,672)	$ (659)	$ (32,170)
Comprehensive income:
Net earnings	34,170				34,170
Other comprehensive income (loss):
Employee benefit funded status adjustment (net of $(709), $(1426), $(835) tax effect in 2009, 2010 and 2011 respectively)	1,987					1,987
Foreign currency translation	100					100
Comprehensive income	36,257
Cash dividends of $0.46, $0.52, $0.60 per share in 2009, 2010 and 2011 respectively	(6,832)				(6,832)
Stock options exercised	1,180	136	[1]	1,044
Tax benefit on stock options and dividends	1,162			1,162
ESSOP transactions	244			170			74
Stock-based compensation	882			882
Issuance of treasury stock (28,27,41 shares in 2009,2010 and 2011 respectively)	545			400				145
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 (loss):
Employee benefit funded status adjustment (net of $(709), $(1426), $(835) tax effect in 2009, 2010 and 2011 respectively)	1,730					1,730
Foreign currency translation	(282)					(282)
Comprehensive income	30,110
Cash dividends of $0.46, $0.52, $0.60 per share in 2009, 2010 and 2011 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 (28,27,41 shares in 2009,2010 and 2011 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 (loss):
Employee benefit funded status adjustment (net of $(709), $(1426), $(835) tax effect in 2009, 2010 and 2011 respectively)	(1,162)					(1,162)
Foreign currency translation	(267)					(267)
Comprehensive income	17,732
Cash dividends of $0.46, $0.52, $0.60 per share in 2009, 2010 and 2011 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 (28,27,41 shares in 2009,2010 and 2011 respectively)	494			284				210
Balance at Dec. 31, 2011	$ 179,281	$ 21,292	[1]	$ 39,445	$ 166,271	$ (14,566)	$ (1,485)	$ (31,676)

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