Stock-Based Compensation (Stock Options and Awards Activity) (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended						12 Months Ended
	Dec. 31, 2011 years	Jan. 01, 2011	Dec. 31, 2011 Restricted Stock [Member]		Dec. 31, 2011 Performance RSUs		Oct. 01, 2011 Performance RSUs		Oct. 01, 2011 Performance RSUs Minimum	Oct. 01, 2011 Performance RSUs Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, Number of Shares, beginning of period	917
Outstanding, Weighted Average Exercise Price Per Share, beginning of period	$ 27.8
Granted, Number of Shares		0
Granted, Weighted Average Exercise Price Per Share	$ 0.00
Exercised, Number of Shares	(66)
Exercised, Weighted Average Exercise Price Per Share	$ 26.27
Forfeitures, Number of Shares	0
Forfeitures, Weighted Average Exercise Price Per Share	$ 0.00
Expirations, Number of Shares	0
Expirations, Weighted Average Exercise Price Per Share	$ 0.00
Outstanding, Number of Shares, end of period	851
Outstanding, Weighted Average Exercise Price Per Share, end of period	$ 27.91
Outstanding, Weighted Average Remaining Contractual Term in Years	4
Outstanding, Aggregate Intrinsic Value	$ 20,742,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Vested and expected to vest, Number of Shares	845
Vested and expected to vest, Weighted Average Exercise Price Per Share	$ 27.87
Vested and expected to vest, Weighted Average Remaining Contractual Term in Years	4
Vested and expected to vest, Aggregate Intrinsic Value	20,626,000
Exercisable, Number of Shares	662
Exercisable, Weighted Average Exercise Price Per Share	$ 27.67
Exercisable, Weighted Average Remaining Contractual Term in Years	3.5
Exercisable, Aggregate Intrinsic Value	16,291,000
Outstanding options, in-the-money	900,000
Aggregate intrinsic value of options exercised under stock option plans	$ 1,600,000	$ 6,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested stock, Number of Shares, beginning of period			404	[1]	101	[2]
Nonvested stock, Weighted Average Grant Date Fair Value, beginning of period			$ 34.71		$ 49.77
Granted, Number of Shares			224	[1]	95	[2]
Granted, Weighted Average Grant Date Fair Value			$ 53.46		$ 63.85
Vested, Number of Shares			(172)	[1]	(44)	[2]
Vested, Weighted Average Grant Date Fair Value			$ 30.93		$ 53.18
Forfeited, Number of Shares			0	[1]	0	[2]
Forfeited, Weighted Average Grant Date Fair Value			$ 0.00		$ 0.00
Nonvested stock, Number of Shares, end of period			456	[1]	152		101	[2]
Nonvested stock, Weighted Average Grant Date Fair Value, end of period			$ 45.37		$ 57.55		$ 49.77
Restricted Stock Units and Awards [Abstract]
Targeted goal of performance based awards and units							100.00%
Percentage of performance-based awards earned by recipient									0.00%	200.00%

[1] Service-based restricted stock vested during each fiscal year.

[2] Performance-based awards and units included at 100% of target goal; under the terms of the awards, the recipient may earn between 0% and 200% of the award.