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Stock-Based Compensation - Stock Option Plan Activity (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2017
$ / 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 265
Weighted Average Remaining Contractual Life 4 years 1 month 28 days
Weighted Average Exercise Price (in dollars per share) $ 12.77
Options Exercisable  
Number of Shares | shares 265
Weighted Average Exercise Price (in dollars per share) $ 12.77
Stock Options | $15.01 - $20.00  
Options Outstanding  
Number of Shares | shares 189
Weighted Average Remaining Contractual Life 6 years 8 months 23 days
Weighted Average Exercise Price (in dollars per share) $ 17.93
Options Exercisable  
Number of Shares | shares 149
Weighted Average Exercise Price (in dollars per share) $ 17.47
Stock Options | $20.01 - $36.25  
Options Outstanding  
Number of Shares | shares 176
Weighted Average Remaining Contractual Life 8 years 8 months 9 days
Weighted Average Exercise Price (in dollars per share) $ 33.19
Options Exercisable  
Number of Shares | shares 30
Weighted Average Exercise Price (in dollars per share) $ 30.36
Stock Options | $11.00 - $36.25  
Options Outstanding  
Number of Shares | shares 630
Weighted Average Remaining Contractual Life 6 years 2 months 12 days
Weighted Average Exercise Price (in dollars per share) $ 20.03
Options Exercisable  
Number of Shares | shares 444
Weighted Average Exercise Price (in dollars per share) $ 15.55