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Stock-Based Compensation - Stock Options By Exercise Price Ranges (Details)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
$8.88 to $13.35  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Low end of exercise price range (in dollars per share) $ 8.88
High end of exercise price range (in dollars per share) $ 13.35
Outstanding options  
Number outstanding (in shares) | shares 3,637,366
Weighted-average remaining contractual life 3 years 2 months 19 days
Weighted-average exercise price (in dollars per share) $ 12.65
Exercisable options  
Number outstanding (in shares) | shares 2,645,735
Weighted-average exercise price (in dollars per share) $ 12.53
$13.50 to $20.52  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Low end of exercise price range (in dollars per share) 13.50
High end of exercise price range (in dollars per share) $ 20.52
Outstanding options  
Number outstanding (in shares) | shares 1,570,183
Weighted-average remaining contractual life 4 years 10 months 13 days
Weighted-average exercise price (in dollars per share) $ 14.38
Exercisable options  
Number outstanding (in shares) | shares 452,466
Weighted-average exercise price (in dollars per share) $ 14.56
$20.75 to $32.90  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Low end of exercise price range (in dollars per share) 20.75
High end of exercise price range (in dollars per share) $ 32.90
Outstanding options  
Number outstanding (in shares) | shares 661,662
Weighted-average remaining contractual life 6 years 3 days
Weighted-average exercise price (in dollars per share) $ 30.67
Exercisable options  
Number outstanding (in shares) | shares 1,259
Weighted-average exercise price (in dollars per share) $ 20.75
$8.88 to $32.90  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Low end of exercise price range (in dollars per share) 8.88
High end of exercise price range (in dollars per share) $ 32.90
Outstanding options  
Number outstanding (in shares) | shares 5,869,211
Weighted-average remaining contractual life 3 years 11 months 19 days
Weighted-average exercise price (in dollars per share) $ 15.14
Exercisable options  
Number outstanding (in shares) | shares 3,099,460
Weighted-average exercise price (in dollars per share) $ 12.83