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Stock-Based Compensation - Stock Options Activity (Details) - Stock Options
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended
Jun. 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 (76)
Cancelled (in shares) | shares (133)
Options outstanding at the end of the period (in shares) | shares 538
Options exercisable at the end of the period (in shares) | shares 538
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 12.34
Cancelled (in dollars per share) | $ / shares 36.53
Options outstanding at end of period, (in dollars per share) | $ / shares 12.66
Options exercisable at the end of period (in dollars per share) | $ / shares $ 12.66
Weighted Average Remaining Life  
Outstanding at the end of the period 2 years
Exercisable at the end of the period 2 years
Aggregate Intrinsic Value  
Outstanding at the end of the period (in dollars) | $ $ 1,225
Exercisable at the end of the period (in dollars) | $ $ 1,225