Long-term Equity-based Compensation - Schedule of Outstanding Options (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Shares Subject to Options	2,543,673	3,192,054
Outstanding Weighted Average Exercise Price	$ 41.38	$ 40.53
Outstanding Weighted Average Remaining Contractual Life	3 years 6 months 26 days
Range of Exercise Prices $10.00 - $15.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Range Limit	$ 10.00
Range of Exercise Prices, Upper Range Limit	$ 15.00
Outstanding Shares Subject to Options	16,750
Outstanding Weighted Average Exercise Price	$ 13.55
Outstanding Weighted Average Remaining Contractual Life	5 years 1 month 6 days
Exercisable Shares Subject to Options	16,750
Exercisable Weighted Average Exercise Price	$ 13.55
Range of Exercise Prices $15.01 - $20.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Range Limit	$ 15.01
Range of Exercise Prices, Upper Range Limit	$ 20.00
Outstanding Shares Subject to Options	8,000
Outstanding Weighted Average Exercise Price	$ 16.48
Outstanding Weighted Average Remaining Contractual Life	5 years 4 months 6 days
Exercisable Shares Subject to Options	8,000
Exercisable Weighted Average Exercise Price	$ 16.48
Range of Exercise Prices $20.01 - $25.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Range Limit	$ 20.01
Range of Exercise Prices, Upper Range Limit	$ 25.00
Outstanding Shares Subject to Options	38,250
Outstanding Weighted Average Exercise Price	$ 23.43
Outstanding Weighted Average Remaining Contractual Life	6 years 0 months 26 days
Exercisable Shares Subject to Options	38,250
Exercisable Weighted Average Exercise Price	$ 23.43
Range of Exercise Prices $25.01 - $30.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Range Limit	$ 25.01
Range of Exercise Prices, Upper Range Limit	$ 30.00
Outstanding Shares Subject to Options	404,000
Outstanding Weighted Average Exercise Price	$ 28.87
Outstanding Weighted Average Remaining Contractual Life	7 years 6 months 29 days
Exercisable Shares Subject to Options	250,812
Exercisable Weighted Average Exercise Price	$ 28.77
Range of Exercise Prices $30.01 - $35.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Range Limit	$ 30.01
Range of Exercise Prices, Upper Range Limit	$ 35.00
Outstanding Shares Subject to Options	255,375
Outstanding Weighted Average Exercise Price	$ 33.19
Outstanding Weighted Average Remaining Contractual Life	9 years 0 months 29 days
Exercisable Shares Subject to Options	91,685
Exercisable Weighted Average Exercise Price	$ 32.72
Range of Exercise Prices $35.01 - $40.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Range Limit	$ 35.01
Range of Exercise Prices, Upper Range Limit	$ 40.00
Outstanding Shares Subject to Options	314,500
Outstanding Weighted Average Exercise Price	$ 37.22
Outstanding Weighted Average Remaining Contractual Life	3 years 11 months 19 days
Exercisable Shares Subject to Options	314,500
Exercisable Weighted Average Exercise Price	$ 37.22
Range of Exercise Prices $40.01 - $45.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Range Limit	$ 40.01
Range of Exercise Prices, Upper Range Limit	$ 45.00
Outstanding Shares Subject to Options	311,868
Outstanding Weighted Average Exercise Price	$ 43.57
Outstanding Weighted Average Remaining Contractual Life	0 years 8 months 16 days
Exercisable Shares Subject to Options	311,868
Exercisable Weighted Average Exercise Price	$ 43.57
Range of Exercise Prices $45.01 - $50.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Range Limit	$ 45.01
Range of Exercise Prices, Upper Range Limit	$ 50.00
Outstanding Shares Subject to Options	958,222
Outstanding Weighted Average Exercise Price	$ 48.64
Outstanding Weighted Average Remaining Contractual Life	1 year 10 months 6 days
Exercisable Shares Subject to Options	958,222
Exercisable Weighted Average Exercise Price	$ 48.64
Range of Exercise Prices $50.01 - $55.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Range Limit	$ 50.01
Range of Exercise Prices, Upper Range Limit	$ 55.00
Outstanding Shares Subject to Options	236,708
Outstanding Weighted Average Exercise Price	$ 50.51
Outstanding Weighted Average Remaining Contractual Life	0 years 4 months 10 days
Exercisable Shares Subject to Options	236,708
Exercisable Weighted Average Exercise Price	$ 50.51
Range of Exercise Prices $10.00 - $55.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Lower Range Limit	$ 10.00
Range of Exercise Prices, Upper Range Limit	$ 55.00
Outstanding Shares Subject to Options	2,543,673
Outstanding Weighted Average Exercise Price	$ 41.38
Outstanding Weighted Average Remaining Contractual Life	3 years 6 months 26 days
Exercisable Shares Subject to Options	2,226,795
Exercisable Weighted Average Exercise Price	$ 42.81