Long-term Equity-based Compensation Plans Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range (Details) - $ / shares	9 Months Ended
	Sep. 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	1,619,000	2,265,711
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 38.97	$ 39.74
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	4 years 11 months 19 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 7 months 6 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 3 months 18 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	146,750
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 29.18
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	6 years 1 day
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	146,750
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 29.18
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	192,375
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 4 months 12 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	146,373
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 33.15
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	780,375
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 36.68
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	6 years 9 months 3 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	470,562
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 36.93
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	0 years
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	478,000
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 48.80
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	9 months 24 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	478,000
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 48.80
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	1,619,000
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Exercise Price	$ 38.97
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	4 years 11 months 21 days
Options and Stock Appreciation Rights, Exercisable at End of Period, Number	1,263,185
Options and Stock Appreciation Rights, Exercisable at End of Period, Weighted Average Exercise Price	$ 39.83