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Stock-Based Compensation - Options Outstanding, by Exercise Price Range (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding (in shares) | shares 1,670
Weighted-Average Remaining Contractual Term (Years) 6 years 11 months
Options Exercisable (in shares) | shares 949
Weighted Average Exercise Price (in dollars per share) $ 36.23
$25.00 to $35.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum (in dollars per share) 25.00
Range of Exercise Prices, maximum (in dollars per share) $ 35
Options Outstanding (in shares) | shares 530
Weighted-Average Remaining Contractual Term (Years) 6 years 4 months
Options Exercisable (in shares) | shares 380
Weighted Average Exercise Price (in dollars per share) $ 30.29
$35.00 to $45.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum (in dollars per share) 35
Range of Exercise Prices, maximum (in dollars per share) $ 45
Options Outstanding (in shares) | shares 724
Weighted-Average Remaining Contractual Term (Years) 7 years 6 months
Options Exercisable (in shares) | shares 366
Weighted Average Exercise Price (in dollars per share) $ 37.24
$45.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum (in dollars per share) $ 45
Options Outstanding (in shares) | shares 416
Weighted-Average Remaining Contractual Term (Years) 6 years 7 months
Options Exercisable (in shares) | shares 203
Weighted Average Exercise Price (in dollars per share) $ 45.53