Stock Based Compensation - Options Summary (Details) (USD $)	9 Months Ended
	Sep. 30, 2013
$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	3 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	40,494
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range	5 years 1 month
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 37.85
Number of Exercisable Options, Exercise Price Range	7,846
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range	$ 37.68
$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	5 years 8 months
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 46.21
Number of Exercisable Options, Exercise Price Range	731
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	29,302
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range	6 years 5 months
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 58.26
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	78,143
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range	5 years 6 months
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 44.24
Number of Exercisable Options, Exercise Price Range	14,732
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range	$ 30.23