Long-term Equity-based Compensation Plans Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
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	2,345,752	2,543,673
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 39.81	$ 41.37
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	4 years 7 months 2 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	16,750
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	4 years 10 months 6 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	16,750
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 1 month 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	30,750
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 23.38
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	5 years 9 months 26 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	30,750
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 23.38
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	390,250
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 28.86
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	7 years 3 months 29 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	237,062
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 28.75
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	246,687
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 33.18
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	8 years 10 months 10 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	88,060
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 32.69
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	564,500
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 36.88
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	6 years 5 months 19 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	312,500
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 37.22
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	194,902
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 43.10
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	0 years 9 months 29 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	194,902
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 43.10
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	821,005
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 48.59
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	1 year 10 months 23 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	821,005
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 48.59
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	72,908
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 51.43
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	0 years 8 months 9 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	72,908
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 51.43
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	2,345,752
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 39.81
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	4 years 7 months 2 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	1,781,937
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 41.78