Long-term Equity-based Compensation Plans Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range (Details) (USD $)	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	2,927,548	3,192,054
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 39.86	$ 40.53
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	4 years 2 months 12 days
Range of Exercise Prices $10.00 - $15.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 10.00
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 15.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	35,000
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 13.55
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	5 years 7 months 6 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	35,000
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 13.55
Range of Exercise Prices $15.01 - $20.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 15.01
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 20.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	8,000
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 16.48
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	5 years 10 months 6 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	8,000
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 16.48
Range of Exercise Prices $20.01 - $25.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 20.01
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 25.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	207,500
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 23.61
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	6 years 7 months 2 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	150,062
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 23.64
Range of Exercise Prices $25.01 - $30.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 25.01
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 30.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	491,250
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 28.78
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	7 years 9 months 22 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	235,873
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 28.64
Range of Exercise Prices $30.01 - $35.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 30.01
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 35.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	262,750
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 33.17
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	9 years 7 months 17 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	36,000
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 31.50
Range of Exercise Prices $35.01 - $40.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 35.01
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 40.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	334,000
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 37.25
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	4 years 3 months 7 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	334,000
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 37.25
Range of Exercise Prices $40.01 - $45.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 40.01
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 45.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	360,618
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 43.58
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	1 year 1 month 13 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	360,618
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 43.58
Range of Exercise Prices $45.01 - $50.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 45.01
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 50.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	991,722
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 48.63
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	2 years 3 months 22 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	991,722
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 48.63
Range of Exercise Prices $50.01 - $55.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 50.01
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 55.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	236,708
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 50.51
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	0 years 10 months 10 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	236,708
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 50.51
Range of Exercise Prices $10.00 - $50.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 10.00
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 55.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	2,927,548
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 39.86
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	4 years 2 months 12 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	2,387,983
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 42.04