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Stock-Based Compensation - Stock Options by Exercise Price Ranges (Details)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
$6.96 to $10.41  
Information about stock options outstanding  
Low end of exercise price range (in dollars per share) $ 6.96
High end of exercise price range (in dollars per share) $ 10.41
Outstanding options  
Number outstanding (in shares) | shares 1,178,054
Weighted-average remaining contractual life 9 months 7 days
Weighted-average exercise price (in dollars per share) $ 8.16
Exercisable options  
Number outstanding (in shares) | shares 1,176,804
Weighted-average exercise price (in dollars per share) $ 8.16
$11.12 to $16.02  
Information about stock options outstanding  
Low end of exercise price range (in dollars per share) 11.12
High end of exercise price range (in dollars per share) $ 16.02
Outstanding options  
Number outstanding (in shares) | shares 5,283,711
Weighted-average remaining contractual life 4 years 8 months 1 day
Weighted-average exercise price (in dollars per share) $ 13.11
Exercisable options  
Number outstanding (in shares) | shares 1,915,712
Weighted-average exercise price (in dollars per share) $ 12.60
$16.59 to $20.75  
Information about stock options outstanding  
Low end of exercise price range (in dollars per share) 16.59
High end of exercise price range (in dollars per share) $ 20.75
Outstanding options  
Number outstanding (in shares) | shares 89,549
Weighted-average remaining contractual life 5 years 5 months 23 days
Weighted-average exercise price (in dollars per share) $ 18.36
Exercisable options  
Number outstanding (in shares) | shares 13,661
Weighted-average exercise price (in dollars per share) $ 16.59
$6.96 to $20.75  
Information about stock options outstanding  
Low end of exercise price range (in dollars per share) 6.96
High end of exercise price range (in dollars per share) $ 20.75
Outstanding options  
Number outstanding (in shares) | shares 6,551,314
Weighted-average remaining contractual life 3 years 11 months 23 days
Weighted-average exercise price (in dollars per share) $ 12.29
Exercisable options  
Number outstanding (in shares) | shares 3,106,177
Weighted-average exercise price (in dollars per share) $ 10.94