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Stock-Based Compensation - Stock Option Plan Activity (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2019
$ / shares
shares
$11.21 - $15.00  
Stock-Based Compensation  
Exercise price, low end of range (in dollars per share) $ 11.21
Exercise price, high end of range (in dollars per share) 15.00
$15.01 - $35.00  
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) 35.00
$35.01 - $42.50  
Stock-Based Compensation  
Exercise price, low end of range (in dollars per share) 35.01
Exercise price, high end of range (in dollars per share) 42.50
$11.21 - $42.50  
Stock-Based Compensation  
Exercise price, low end of range (in dollars per share) 11.21
Exercise price, high end of range (in dollars per share) $ 42.50
Stock Options | $11.21 - $15.00  
Options Outstanding  
Number of Shares | shares 45
Weighted-Average Remaining Contractual Life 2 years 10 months 24 days
Weighted-Average Exercise Price (in dollars per share) $ 13.60
Options Exercisable  
Number of Shares | shares 45
Weighted-Average Exercise Price (in dollars per share) $ 13.60
Stock Options | $15.01 - $35.00  
Options Outstanding  
Number of Shares | shares 200
Weighted-Average Remaining Contractual Life 5 years 1 month 6 days
Weighted-Average Exercise Price (in dollars per share) $ 21.47
Options Exercisable  
Number of Shares | shares 200
Weighted-Average Exercise Price (in dollars per share) $ 21.47
Stock Options | $35.01 - $42.50  
Options Outstanding  
Number of Shares | shares 137
Weighted-Average Remaining Contractual Life 7 years 8 months 12 days
Weighted-Average Exercise Price (in dollars per share) $ 39.67
Options Exercisable  
Number of Shares | shares 56
Weighted-Average Exercise Price (in dollars per share) $ 38.51
Stock Options | $11.21 - $42.50  
Options Outstanding  
Number of Shares | shares 382
Weighted-Average Remaining Contractual Life 5 years 9 months 18 days
Weighted-Average Exercise Price (in dollars per share) $ 27.06
Options Exercisable  
Number of Shares | shares 301
Weighted-Average Exercise Price (in dollars per share) $ 23.45