Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	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
Beginning balance at Dec. 31, 2013	$ 196,563	$ 41,008	[1]	$ 25,123	$ 170,318	$ (7,524)	$ (1,075)	$ (31,287)
Increase (Decrease) in Stockholders' Equity
Net earnings	29,678				29,678
Pension and postretirement benefits (net of tax effect)	(2,611)					(2,611)
Foreign currency translation	(1,721)					(1,721)
Cash dividends	(10,631)				(10,631)
Stock options exercised	730	38	[1]	692
Tax benefit on stock options and dividends	38			38
ESSOP transactions	367			214			153
Stock-based compensation	1,449			1,449
Issuance of treasury stock	469			314				155
Ending balance at Dec. 31, 2014	214,331	41,046	[1]	27,830	189,365	(11,856)	(922)	(31,132)
Increase (Decrease) in Stockholders' Equity
Net earnings	25,938				25,938
Pension and postretirement benefits (net of tax effect)	(77)					(77)
Foreign currency translation	(847)					(847)
Cash dividends	(11,259)				(11,259)
Stock options exercised	1,641	57	[1]	1,517				67
Tax benefit on stock options and dividends	141			141
ESSOP transactions	396			242			154
Stock-based compensation	1,541			1,541
Issuance of treasury stock	470			355				115
Ending balance at Dec. 31, 2015	232,275	41,103	[1]	31,626	204,044	(12,780)	(768)	(30,950)
Increase (Decrease) in Stockholders' Equity
Net earnings	32,295				32,295
Pension and postretirement benefits (net of tax effect)	1,473					1,473
Foreign currency translation	(328)					(328)
Cash dividends	(12,463)				(12,463)
Stock options exercised	569	19	[1]	528				22
Tax deficiency on stock options and dividends	(110)			(110)
ESSOP transactions	443			289			154
Stock-based compensation	1,537			1,537
Retirement of treasury stock	0	(4,000)		(6,260)				10,260
Issuance of treasury stock	518			412				106
Ending balance at Dec. 31, 2016	$ 256,209	$ 37,122	[1]	$ 28,022	$ 223,876	$ (11,635)	$ (614)	$ (20,562)

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