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Stock-Based Compensation - Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Number of Options  
Outstanding at beginning of period (in shares) | shares 520
Granted (in shares) | shares 119
Exercised (in shares) | shares (35)
Forfeited/canceled/expired (in shares) | shares (7)
Outstanding at end of period (in shares) | shares 597
Vested and expected to vest at end of period (in shares) | shares 597
Exercisable at end of period (in shares) | shares 414
Weighted-Average Exercise Price  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 42.56
Granted (in dollars per share) | $ / shares 44.95
Exercised (in dollars per share) | $ / shares 24.67
Forfeited/canceled/expired (in dollars per share) | $ / shares 27.74
Outstanding at end of period (in dollars per share) | $ / shares 44.27
Vested and expected to vest at end of period (in dollars per share) | $ / shares 44.27
Exercisable at end of period (in dollars per share) | $ / shares $ 41.74
Weighted-Average Remaining Contractual Term (in years)  
Outstanding at end of period 4 years 4 months 2 days
Vested and expected to vest at end of period 4 years 4 months 2 days
Exercisable at end of period 3 years 7 months 21 days
Aggregate Intrinsic Value  
Exercised | $ $ 744
Outstanding at end of period | $ 2,972
Vested and expected to vest at end of period | $ 2,972
Exercisable at end of period | $ $ 2,972