CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Comprehensive Income [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2008		$ 47,903	$ 94,500	$ 899,928	$ (72,551)		$ (103,018)
Comprehensive Income [Abstract]
Net earnings	95,221			95,221		95,221
Pension and postretirement adjustment, net	16,350				16,350	16,350
Foreign currency translation adjustments, net	36,596				36,596	36,596
Total comprenhensive income (loss)						148,167
Dividends paid				(14,559)
Stock options exercised, net		311	6,085				4,727
Share-based compensation			11,431				3,833
Other			(309)				309
Ending Balance at Dec. 31, 2009		48,214	111,707	980,590	(19,605)		(94,149)
Comprehensive Income [Abstract]
Net earnings	106,598			106,598		106,598
Pension and postretirement adjustment, net	(14,791)				(14,791)	(14,791)
Foreign currency translation adjustments, net	31,583				31,583	31,583
Total comprenhensive income (loss)						123,390
Dividends paid				(14,729)
Stock options exercised, net		344	6,937				4,026
Share-based compensation			11,768				1,610
Other			(319)				319
Ending Balance at Dec. 31, 2010	1,160,103	48,558	130,093	1,072,459	(2,813)		(88,194)
Comprehensive Income [Abstract]
Net earnings	130,423			130,423		130,423
Pension and postretirement adjustment, net	(43,846)				(43,846)	(43,846)
Foreign currency translation adjustments, net	(18,472)				(18,472)	(18,472)
Total comprenhensive income (loss)						68,105
Dividends paid				(14,893)
Stock options exercised, net		321	5,312				8,648
Share-based compensation			8,046				1,575
Repurchases of company stock	8,178						(8,178)
Other			(259)				259
Ending Balance at Dec. 31, 2011	$ 1,229,039	$ 48,879	$ 143,192	$ 1,187,989	$ (65,131)		$ (85,890)