Consolidated Statement Of Changes In Stockholders' Equity And Comprehensive Income (USD $) In Thousands, except Share data	Comprehensive Income [Member]	Common Stock [Member]	Capital In Excess Of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total
Beginning balance at Jan. 01, 2011		$ 199	$ 540,294	$ 503,689	$ (33,709)	$ (214,683)	$ 795,790
Beginning balance, shares at Jan. 01, 2011						(11,011,494)	(11,011,494)
Beginning balance, shares at Jan. 01, 2011		101,659,924					101,659,924
Net income	69,371			69,371			69,371
Derivative transactions, net of tax	(29,839)				(29,839)		(29,839)
Amortization of prior service credits, net of tax	(85)				(85)		(85)
Amortization of actuarial loss, net of tax	886				886		886
Comprehensive income	40,333
Adjustment for 3 for 2 stock split (Note 1) , shares		50,828,084				(5,375,912)
Adjustment for 3 for 2 stock split (Note 1) , value				(39)			(39)
Exercise of stock options			(2,571)			15,042	12,471
Exercise of stock options, shares						773,015	1,135,000
Deferred stock issuance			(1,158)			1,117	(41)
Deferred stock issuance, shares						56,505
Issuance of performance-contingent restricted stock			(4,213)			4,213
Issuance of performance-contingent restricted stock, shares						216,050
Amortization of share-based payment compensation			8,043				8,043
Tax benefits related to share based payment awards			2,924				2,924
Performance-contingent restricted stock awards forfeitures and cancellations			865			(865)
Performance-contingent restricted stock awards forfeitures and cancellations, shares						(44,505,000)
Stock repurchases						(18,029)	(18,029)
Stock repurchases, shares						(695,403)
Issuance of deferred compensation			(115)			115
Issuance of deferred compensation, shares						5,092,000
Contingent acquisition consideration			(5,000)				(5,000)
Dividends paid - $0.283 per common share				(38,433)			(38,433)
Ending balance at Jul. 16, 2011		$ 199	$ 539,069	$ 534,588	$ (62,747)	$ (213,090)	$ 798,019
Ending balance, shares at Jul. 16, 2011						(16,076,652)	(16,076,652)
Ending balance, shares at Jul. 16, 2011		152,488,008					152,488,008