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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Shares    
Outstanding at beginning of period (in shares) 23,231 37,495
Exercised (in shares) (8,842) (12,304)
Forfeited or expired (in shares) (831) (1,308)
Outstanding at end of period (in shares) 13,558 23,883
Shares, Vested and expected to vest (in shares) 13,558 23,883
Shares, Exercisable (in shares) 13,558 23,883
Weighted-Average Exercise Price    
Outstanding at beginning of period (in usd per share) $ 14.21 $ 13.77
Exercised (in usd per share) 13.30 12.92
Forfeited or expired (in usd per share) 14.77 13.53
Outstanding at end of period (in usd per share) 14.77 14.23
Weighted-Average Exercise Price, Vested and expected to vest (in usd per share) 14.77 14.23
Weighted-Average Exercise Price, Exercisable (in usd per share) $ 14.77 $ 14.23
Weighted-Average Remaining Contractual Term, Outstanding 1 year 7 months 21 days 2 years 5 months 12 days
Weighted-Average Remaining Contractual Term, Vested and expected to vest 1 year 7 months 21 days 2 years 5 months 12 days
Weighted-Average Remaining Contractual Term, Exercisable 1 year 7 months 21 days 2 years 5 months 12 days
Aggregate Intrinsic Value, Outstanding $ 276 $ 365
Aggregate Intrinsic Value, Vested and expected to vest 276 365
Aggregate Intrinsic Value, Exercisable $ 276 $ 365