Consolidated Statement Of Changes In Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balances at Dec. 31, 2011	$ 758,968	$ 199	$ 544,065	$ 547,997	$ (112,047)	$ (221,246)
Balances (in shares) at Dec. 31, 2011		152,488,008				(16,506,822)
Net income	97,554			97,554
Derivative transactions, net of tax	19,725				19,725
Pension and postretirement plans, net of tax	2,143				2,143
Shares issued for acquisition	45,887		16,628			29,259
Shares issued for acquisition, shares						2,178,648
Exercise of stock options	9,112		(165)			9,277
Exercise of stock options, shares						690,115
Deferred stock issuance			(610)			610
Deferred stock issuance, shares						45,405
Amortization of share-based payment awards	6,834		6,834
Tax benefits related to share based payment awards	1,451		1,451
Performance-contingent restricted stock awards forfeitures and cancellations			606			606
Performance-contingent restricted stock awards forfeitures and cancellations, shares						(45,252)
Stock repurchases	(13,587)					(13,587)
Stock repurchases, shares						(670,742)
Issuance of deferred compensation			(34)			34
Issuance of deferred compensation, shares						1,647
Dividends paid on vested performance-contingent restricted stock awards and deferred share awards	(255)			(255)
Dividends paid - $0.470 per common share	(64,171)			(64,171)
Balances at Oct. 06, 2012	$ 863,661	$ 199	$ 568,775	$ 581,125	$ (90,179)	$ (196,259)
Balances (in shares) at Oct. 06, 2012		152,488,008				(14,307,001)