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Stock-Based Compensation - Stock Option Plan Activity (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2016
$ / 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 - $30.36  
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) 30.36
$11.00 - $30.36  
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) $ 30.36
Stock Options | $11.00 - $15.00  
Options Outstanding  
Number of Shares | shares 361
Weighted Average Remaining Contractual Life 4 years 7 months 17 days
Weighted Average Exercise Price (in dollars per share) $ 12.64
Options Exercisable  
Number of Shares | shares 361
Weighted Average Exercise Price (in dollars per share) $ 12.64
Stock Options | $15.01 - $20.00  
Options Outstanding  
Number of Shares | shares 251
Weighted Average Remaining Contractual Life 7 years 8 months 19 days
Weighted Average Exercise Price (in dollars per share) $ 17.89
Options Exercisable  
Number of Shares | shares 112
Weighted Average Exercise Price (in dollars per share) $ 17.30
Stock Options | $20.01 - $30.36  
Options Outstanding  
Number of Shares | shares 102
Weighted Average Remaining Contractual Life 9 years 2 months 23 days
Weighted Average Exercise Price (in dollars per share) $ 30.36
Stock Options | $11.00 - $30.36  
Options Outstanding  
Number of Shares | shares 714
Weighted Average Remaining Contractual Life 6 years 4 months 13 days
Weighted Average Exercise Price (in dollars per share) $ 17.01
Options Exercisable  
Number of Shares | shares 473
Weighted Average Exercise Price (in dollars per share) $ 13.74