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Stock-Based Compensation - Stock Option Plan Activity (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2018
$ / shares
shares
$11.00 - $15.00  
Stock-Based Compensation  
Exercise price, low end of range (in dollars per share) $ 11.00
Exercise price, high end of range (in dollars per share) 15.00
$15.01 - $20.00  
Stock-Based Compensation  
Exercise price, low end of range (in dollars per share) 15.01
Exercise price, high end of range (in dollars per share) 20.00
$20.01 - $36.25  
Stock-Based Compensation  
Exercise price, low end of range (in dollars per share) 20.01
Exercise price, high end of range (in dollars per share) 36.25
$11.00 - $36.25  
Stock-Based Compensation  
Exercise price, low end of range (in dollars per share) 11.00
Exercise price, high end of range (in dollars per share) $ 36.25
Stock Options | $11.00 - $15.00  
Options Outstanding  
Number of Shares | shares 109
Weighted-Average Remaining Contractual Life 3 years 6 months 15 days
Weighted-Average Exercise Price (in dollars per share) $ 13.61
Options Exercisable  
Number of Shares | shares 109
Weighted-Average Exercise Price (in dollars per share) $ 13.61
Stock Options | $15.01 - $20.00  
Options Outstanding  
Number of Shares | shares 158
Weighted-Average Remaining Contractual Life 5 years 8 months 12 days
Weighted-Average Exercise Price (in dollars per share) $ 17.83
Options Exercisable  
Number of Shares | shares 158
Weighted-Average Exercise Price (in dollars per share) $ 17.83
Stock Options | $20.01 - $36.25  
Options Outstanding  
Number of Shares | shares 232
Weighted-Average Remaining Contractual Life 8 years 2 months 27 days
Weighted-Average Exercise Price (in dollars per share) $ 36.58
Options Exercisable  
Number of Shares | shares 69
Weighted-Average Exercise Price (in dollars per share) $ 32.38
Stock Options | $11.00 - $36.25  
Options Outstanding  
Number of Shares | shares 499
Weighted-Average Remaining Contractual Life 6 years 4 months 28 days
Weighted-Average Exercise Price (in dollars per share) $ 25.65
Options Exercisable  
Number of Shares | shares 336
Weighted-Average Exercise Price (in dollars per share) $ 19.46