CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY AND COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands	Common Stock [Member]	Capital In Excess of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2010	$ 47,872	$ 77,471	$ 97,535	$ 716	$ (13,711)	$ 209,883
Comprehensive income:
Net income			33,090			33,090
Foreign currency translation adjustment				(1,500)		(1,500)
Pension and retiree medical adjustment, net of tax				5,180		5,180
Total comprehensive income						36,770
Cash dividends paid			(4,788)			(4,788)
Purchase of treasury stock					(3,285)	(3,285)
Stock-based compensation and related tax benefits		683			1,012	1,695
Stock options and related tax benefits		21			183	204
Employee Stock Ownership Plan		548			1,966	2,514
Balance at Sep. 30, 2011	$ 47,872	$ 78,723	$ 125,837	$ 4,396	$ (13,835)	$ 242,993