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Employee Benefits and Share-Based Compensation - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Aug. 02, 2016 | Nov. 04, 2014
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 |
2014 Share 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
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 |  | $ 54,900,000 |  |  |
Number of shares repurchased (in shares) | 0 | 0 | 0 | 0 |  |
2009 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options granted (in shares) | 0 |  | 150,000 |  |  |
Weighted-average fair value of options granted (in dollars per share) |  | $ 26.03 | $ 33.89 | $ 26.21 |  |
Intrinsic value of options exercised | $ 16,800,000 | $ 2,500,000 | $ 30,800,000 | $ 12,400,000 |  |
Unrecognized compensation cost of unvested stock options | 43,800,000 |  | $ 43,800,000 |  |  |
2009 Plan | Stock Options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted average period of compensation cost not yet recognized |  |  | 2 years 7 months 6 days |  |  |
2009 Plan | RSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted average period of compensation cost not yet recognized |  |  | 3 years |  |  |
Unrecognized compensation cost | 48,200,000 |  | $ 48,200,000 |  |  |
2009 Plan | RSAs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted average period of compensation cost not yet recognized |  |  | 10 months 24 days |  |  |
Unrecognized compensation cost | 1,200,000 |  | $ 1,200,000 |  |  |
2009 Plan | PSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted average period of compensation cost not yet recognized |  |  | 1 year 6 months |  |  |
Unrecognized compensation cost | 8,600,000 |  | $ 8,600,000 |  |  |
1997 Plan | ESPP shares available for future issuance |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares purchased under ESPP (in shares) |  |  | 156,000 | 217,000 |  |
Weighted-average price of shares purchased (in dollars per share) |  |  | $ 59.75 | $ 43.51 |  |
Unrecognized compensation cost | $ 2,900,000 |  | $ 2,900,000 |  |  |
Weighted average period of compensation cost not yet recognized |  |  | 1 year 3 months 18 days |  |  |

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