Long-term Equity-based Compensation Plans Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range (Details) - $ / shares	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
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	1,800,375	2,265,711
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 39.46	$ 39.74
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	4 years 9 months 29 days
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
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	4,000
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	3 years 10 months 7 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	4,000
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
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	17,500
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 23.27
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	4 years 6 months 19 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	17,500
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 23.27
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
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	151,125
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 29.20
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	6 years 3 months 5 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	105,123
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 29.03
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
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	196,750
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 33.23
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	7 years 7 months 12 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	104,750
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 33.04
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
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	837,000
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 36.72
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	6 years 8 months 22 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	404,998
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 37.17
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
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	0
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 0.00
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	0
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 0.00
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
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	594,000
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 48.62
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	10 months 17 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	594,000
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 48.62
Range of Exercise Prices $15.01 - $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	15.01
Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 50
Options and Stock Appreciation Rights, Outstanding at End of Period, Number	1,800,375
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 39.46
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	4 years 9 months 29 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	1,230,371
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 41.38