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Stock-Based Compensation - Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Number of Options  
Outstanding at beginning of period (in shares) | shares 745
Granted (in shares) | shares 109
Exercised (in shares) | shares 0
Forfeited/canceled/expired (in shares) | shares 0
Outstanding at end of period (in shares) | shares 854
Vested and expected to vest at end of period (in shares) | shares 854
Exercisable at end of period (in shares) | shares 613
Weighted-Average Exercise Price  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 41.73
Granted (in dollars per share) | $ / shares 46.17
Exercised (in dollars per share) | $ / shares 0
Forfeited/canceled/expired (in dollars per share) | $ / shares 0
Outstanding at end of period (in dollars per share) | $ / shares 42.29
Vested and expected to vest at end of period (in dollars per share) | $ / shares 42.29
Exercisable at end of period (in dollars per share) | $ / shares $ 43.34
Weighted-Average Remaining Contractual Term (in years)  
Outstanding at end of period 3 years 10 months 17 days
Vested and expected to vest at end of period 3 years 10 months 17 days
Exercisable at end of period 2 years 11 months 4 days
Aggregate Intrinsic Value  
Exercised | $ $ 0
Outstanding at end of period | $ 7,266
Vested and expected to vest at end of period | $ 7,266
Exercisable at end of period | $ $ 5,412