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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, 2016
USD ($)
$ / shares
shares
Stock Options  
Options outstanding at the beginning of the period (in shares) | shares 1,247
Granted (in shares) | shares 0
Cancelled (in shares) | shares (494)
Options outstanding at the end of the period (in shares) | shares 753
Options exercisable at the end of the period (in shares) | shares 722
Weighted Average Exercise Price Per Share  
Options outstanding at the beginning of the period (in dollars per share) | $ / shares $ 18.28
Granted (in dollars per share) | $ / shares 0.00
Cancelled (in dollars per share) | $ / shares 20.35
Options outstanding at end of period, (in dollars per share) | $ / shares 16.92
Options exercisable at the end of period (in dollars per share) | $ / shares $ 16.55
Weighted Average Remaining Life  
Outstanding at the end of the period 2 years 6 months
Exercisable at the end of the period 2 years 4 months 24 days
Aggregate Intrinsic Value  
Outstanding at the end of the period (in dollars) | $ $ 733
Exercisable at the end of the period (in dollars) | $ $ 733