Stock Based Compensation - Options Summary (Details) (USD $)	9 Months Ended
	Sep. 30, 2014
$0.00 - $10.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 0.00
Exercise Price Range, Upper Range Limit	$ 10.00
Number of Outstanding Options, Exercise Price Range	0
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range	0 years
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 0
Number of Exercisable Options, Exercise Price Range	0
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range	$ 0
$10.01 - $20.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 10.01
Exercise Price Range, Upper Range Limit	$ 20.00
Number of Outstanding Options, Exercise Price Range	6,155
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range	2 years 4 months
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 18.82
Number of Exercisable Options, Exercise Price Range	6,155
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range	$ 18.82
$20.01 - $30.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 20.01
Exercise Price Range, Upper Range Limit	$ 30.00
Number of Outstanding Options, Exercise Price Range	0
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range	0 years
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 0
Number of Exercisable Options, Exercise Price Range	0
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range	$ 0
$30.01 - $40.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 30.01
Exercise Price Range, Upper Range Limit	$ 40.00
Number of Outstanding Options, Exercise Price Range	35,020
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range	4 years 1 month
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 37.87
Number of Exercisable Options, Exercise Price Range	23,954
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range	$ 37.75
$40.01 - $50.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 40.01
Exercise Price Range, Upper Range Limit	$ 50.00
Number of Outstanding Options, Exercise Price Range	2,192
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range	4 years 8 months
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 46.21
Number of Exercisable Options, Exercise Price Range	1,462
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range	$ 46.21
$50.01 - $60.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 50.01
Exercise Price Range, Upper Range Limit	$ 60.00
Number of Outstanding Options, Exercise Price Range	28,592
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range	5 years 5 months
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 58.26
Number of Exercisable Options, Exercise Price Range	9,057
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range	$ 58.26
$60.01 - $70.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 60.01
Exercise Price Range, Upper Range Limit	$ 70.00
Number of Outstanding Options, Exercise Price Range	0
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range	0 years
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 0
Number of Exercisable Options, Exercise Price Range	0
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range	$ 0
$70.01 - $80.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 70.01
Exercise Price Range, Upper Range Limit	$ 80.00
Number of Outstanding Options, Exercise Price Range	37,048
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range	6 years 5 months
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 73.47
Number of Exercisable Options, Exercise Price Range	0
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range	$ 0
Total
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding Options, Exercise Price Range	109,007
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range	5 years 1 month
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 54.41
Number of Exercisable Options, Exercise Price Range	40,628
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range	$ 39.76