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Employee Benefits and Share-Based Compensation - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Aug. 02, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | $ 10,659,000 | $ 8,410,000 |
Number of shares repurchased (in shares) | 0 | 0 |
2016 and 2014 Share Repurchase Programs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Remaining value of shares authorized for repurchase under stock repurchase programs | $ 54,900,000 |  |
The 2016 Repurchase Program |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Value of shares authorized for repurchase under stock repurchase programs |  |  | $ 50,000,000.0
2009 Plan | Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted-average fair value of options granted (in dollars per share) | $ 26.31 | $ 24.07 |
Intrinsic value of options exercised | $ 9,900,000 | $ 17,100,000 |
Unrecognized compensation cost of unvested stock options | $ 46,600,000 |  |
Weighted average period of compensation cost not yet recognized (in years) | 2 years 10 months 24 days |  |
2009 Plan | RSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average period of compensation cost not yet recognized (in years) | 3 years |  |
Unrecognized compensation cost | $ 34,100,000 |  |
2009 Plan | RSAs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average period of compensation cost not yet recognized (in years) | 1 month 6 days |  |
Unrecognized compensation cost | $ 200,000 |  |
2009 Plan | PSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average period of compensation cost not yet recognized (in years) | 1 year 6 months |  |
Unrecognized compensation cost | $ 6,700,000 |  |
1997 Plan | ESPP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average period of compensation cost not yet recognized (in years) | 1 year 4 months 24 days |  |
Shares purchased under ESPP (in shares) | 217,000 | 210,000 |
Weighted-average price of shares purchased (in dollars per share) | $ 43.51 | $ 40.20 |
Unrecognized compensation cost | $ 7,700,000 |  |

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