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Stock-Based Compensation Plans and Employee Benefits (Performance Incentive Plans) (Details) $ / shares in Units, $ in Thousands | 3 Months Ended |
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Mar. 31, 2021 USD ($) ownership_class $ / shares shares | Mar. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting rights percentage | 15.00% |  |
Equity-based compensation | $ 5,508 | $ 16,270 |
Performance Incentive Plan |  |  |
Accrued expenses | $ 85,895 |  | $ 94,724
iPIP Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 6 years |  |
Vesting rights percentage | 40.00% |  |
Performance Incentive Plan |  |  |
Accrued expenses | $ 68,600 |  | $ 69,100
2019-2022 Performance Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of ownership classes of consolidated subsidiary | ownership_class | 2 |  |
Ownership percentage of class A units (as a percent) | 100.00% |  |
Equity-based compensation | $ 1,400 | 700 |
Settlement or distribution on units and awards, cash (as a percent) | 50.00% |  |
Settlement or distribution on units and awards, common stock (as a percent) | 50.00% |  |
2019-2020 Performance Incentive Plans |  |  |
Performance Incentive Plan |  |  |
Points at beginning of period (in shares) | 97.20 |  |
Granted (in shares) | 0 |  |
Forfeited (in shares) | (0.20) |  |
Points at end of period (in shares) | 97.40 |  |
2021-2022 Performance Incentive Plans |  |  |
Performance Incentive Plan |  |  |
Points at beginning of period (in shares) | 94.00 |  |
Granted (in shares) | 94.00 |  |
Forfeited (in shares) | 0 |  |
Points at end of period (in shares) | 0 |  |
2013-2018 Performance Incentive Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity-based compensation | $ 2,400 | 14,300 |
Settlement or distribution on units and awards, cash (as a percent) | 50.00% |  |
Settlement or distribution on units and awards, common stock (as a percent) | 50.00% |  |
2013-2014 Performance Incentive Plan |  |  |
Performance Incentive Plan |  |  |
Points at beginning of period (in shares) | 80.17 |  |
Forfeited (in shares) | 0 |  |
Points at end of period (in shares) | 80.17 |  |
2015-2016 Performance Incentive Plan |  |  |
Performance Incentive Plan |  |  |
Points at beginning of period (in shares) | 70.40 |  |
Forfeited (in shares) | 0 |  |
Points at end of period (in shares) | 70.40 |  |
iPIP distributions to plan participants | $ 2,800 | $ 1,500 |
iPIP distributions, equity component (in shares) | shares | 86,807 | 54,245 |
iPIP distributions, equity component, fair value (in dollars per share) | $ / shares | $ 17.72 | $ 14.51 |
iPIP distributions, shares issued net of tax withholdings (in shares) | shares | 51,854 | 32,825 |
2017-2018 Performance Incentive Plan |  |  |
Performance Incentive Plan |  |  |
Points at beginning of period (in shares) | 73.34 |  |
Forfeited (in shares) | 0 |  |
Points at end of period (in shares) | 73.34 |  |

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