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Employee Benefits and Share-Based Compensation - Narrative (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 17, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Aug. 02, 2016 | Nov. 04, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Aggregate purchase price for repurchased shares |  |  |  | $ 0 | $ 53,035,000 |  |
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 (up to) |  |  |  |  |  | $ 50,000,000 |
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 (up to) |  |  |  |  |  |  | $ 50,000,000
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 |  |
One-Time Stock Repurchase Transaction |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Value of shares authorized for repurchase under stock repurchase programs (up to) | $ 75,000,000 |  |  |  |  |  |
Number of shares repurchased (in shares) | 749,300 |  |  |  |  |  |
Average price of repurchased shares (in dollars per share) | $ 70.78 |  |  |  |  |  |
Aggregate purchase price for repurchased shares | $ 53,000,000 |  |  |  |  |  |
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) |  |  |  | 287,000 | 333,000 |  |
Weighted-average price of shares purchased (in dollars per share) |  |  |  | $ 62.14 | $ 48.77 |  |
Unrecognized compensation cost |  | $ 3,100,000 |  | $ 3,100,000 |  |  |
Weighted average period of compensation cost not yet recognized |  |  |  | 1 year 6 months |  |  |
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) |  |  | $ 23.75 | $ 33.89 | $ 25.30 |  |
Intrinsic value of options exercised |  | $ 26,000,000 | $ 4,100,000 | $ 56,800,000 | $ 16,500,000 |  |
Unrecognized compensation cost of unvested stock options |  | 38,400,000 |  | $ 38,400,000 |  |  |
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 4 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 |  |  |  | 3 years 1 month 6 days |  |  |
Unrecognized compensation cost |  | 73,400,000 |  | $ 73,400,000 |  |  |
2009 Plan | RSAs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted average period of compensation cost not yet recognized |  |  |  | 8 months 12 days |  |  |
Unrecognized compensation cost |  | 1,000,000 |  | $ 1,000,000 |  |  |
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 2 months 12 days |  |  |
Unrecognized compensation cost |  | $ 7,000,000 |  | $ 7,000,000 |  |  |

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