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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2019
Number of Options  
Beginning balance (in shares) 3,077,624
Granted (in shares) 125,640
Exercised (in shares) (1,192,397)
Forfeited / Expired (in shares) (124,198)
Ending balance (in shares) 1,886,669
Vested, at end of period (in shares) 1,447,398
Vested or expected to vest, at end of period (in shares) 1,835,967
Weighted Average Exercise Price  
Beginning balance (in dollars per share) $ 39.16
Granted (in dollars per share) 93.16
Exercised (in dollars per share) 34.68
Forfeited / Expired (in dollars per share) 50.58
Ending balance (in dollars per share) 44.84
Vested, at end of period (in dollars per share) $ 38.25
Aggregate Intrinsic Value  
Exercised $ 99,206
Ending balance 226,571
Vested, at end of period 183,351
Vested or expected to vest, at end of period $ 222,101
Weighted Average Remaining Contractual Term (Years)  
Options outstanding, weighted average remaining contractual term 5 years 7 months 6 days
Options vested, weighted average remaining contractual term 4 years 9 months 18 days