Stock-Based Compensation and Other Employee Benefits - Matching Contributions (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Employer contributions | $ 6,200 | $ 5,998 | $ 5,469 |
| 401(k) plan | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Employer contributions | 5,650 | 5,452 | 4,957 |
| Group Personal Pension Plan | UNITED KINGDOM | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Employer contributions | 202 | 190 | 161 |
| Registered Retirement Savings Plan | Canada | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Employer contributions | $ 348 | $ 356 | $ 351 |
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