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Stock-Based Compensation - Stock Options Activity (Details) - Stock Options
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Stock Options  
Options outstanding at the beginning of the period (in shares) | shares 747
Granted (in shares) | shares 0
Exercised (in shares) | shares (83)
Cancelled (in shares) | shares (175)
Options outstanding at the end of the period (in shares) | shares 489
Options exercisable at the end of the period (in shares) | shares 489
Weighted Average Exercise Price Per Share  
Options outstanding at the beginning of the period (in dollars per share) | $ / shares $ 16.88
Granted (in dollars per share) | $ / shares 0.00
Exercised (in dollars per share) | $ / shares 12.04
Cancelled (in dollars per share) | $ / shares 32.00
Options outstanding at end of period, (in dollars per share) | $ / shares 12.28
Options exercisable at the end of period (in dollars per share) | $ / shares $ 12.28
Weighted Average Remaining Life  
Outstanding at the end of the period 1 year 9 months 18 days
Exercisable at the end of the period 1 year 9 months 18 days
Aggregate Intrinsic Value  
Outstanding at the end of the period (in dollars) | $ $ 1,494
Exercisable at the end of the period (in dollars) | $ $ 1,494