Share-Based Compensation Share-Based Compensation Price Ranges (Details)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding Stock Options (in shares) | shares	2,550,883
Outstanding Stock Options Weighted Average Remaining Contractual Term (in years)	4 years 2 months 19 days
Outstanding Stock Options Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 34.70
Exercisable Stock Options (in shares) | shares	1,800,183
Exercisable Stock Options, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 24.19
Exercise Price Range 18.00 to 20.34 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding Stock Options (in shares) | shares	1,100,811
Outstanding Stock Options Weighted Average Remaining Contractual Term (in years)	2 years 2 months 19 days
Outstanding Stock Options Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 19.65
Exercisable Stock Options (in shares) | shares	1,100,811
Exercisable Stock Options, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 19.65
Exercise Price Range 20.35 to 45.61 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding Stock Options (in shares) | shares	947,497
Outstanding Stock Options Weighted Average Remaining Contractual Term (in years)	4 years 5 months 23 days
Outstanding Stock Options Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 33.83
Exercisable Stock Options (in shares) | shares	696,372
Exercisable Stock Options, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 31.22
Exercise Price Range 45.62 to 102.41 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding Stock Options (in shares) | shares	502,575
Outstanding Stock Options Weighted Average Remaining Contractual Term (in years)	8 years 1 month 17 days
Outstanding Stock Options Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 69.30
Exercisable Stock Options (in shares) | shares	3,000
Exercisable Stock Options, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 59.23