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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, 2015
USD ($)
$ / shares
shares
Stock Options  
Options outstanding at the beginning of the period (in shares) | shares 1,495
Granted (in shares) | shares 0
Exercised (in shares) | shares (90)
Cancelled (in shares) | shares (300)
Options outstanding at the end of the period (in shares) | shares 1,105
Options exercisable at the end of the period (in shares) | shares 984
Weighted Average Exercise Price Per Share  
Options outstanding at the beginning of the period (in dollars per share) $ 33.39
Granted (in dollars per share) 0.00
Exercised (in dollars per share) 12.29
Cancelled (in dollars per share) 59.91
Options outstanding at end of period, (in dollars per share) 27.91
Options exercisable at the end of period (in dollars per share) $ 27.08
Weighted Average Remaining Life  
Outstanding at the end of the period 2 years 7 months 6 days
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) | $ $ 2,207
Exercisable at the end of the period (in dollars) | $ 2,207
Total intrinsic value of stock options exercised (in dollars) | $ 1,500
Expected unrecognized compensation cost related to unvested stock options (in dollars) | $ $ 900
Weighted-average period over which the expected unrecognized compensation cost related to unvested stock options will be recognized 1 year 2 months 12 days
First anniversary vesting  
Stock-based compensation  
Vesting percentage 33.33%
Second anniversary vesting  
Stock-based compensation  
Vesting percentage 33.33%
Third anniversary vesting  
Stock-based compensation  
Vesting percentage 33.33%
Vesting period 3 years
Maximum  
Stock-based compensation  
Expiration period 7 years