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Stock-Based Compensation Plans and Employee Benefits (Performance Incentive Plans) (Details) $ / shares in Units, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) ownership_class $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) | May 01, 2019 shares | Apr. 30, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting rights percentage | 15.00% |  |  |  |
Equity-based compensation | $ | $ 39,354 | $ 30,436 | $ 17,563 |  |
Performance Incentive Plan |  |  |  |  |
Accrued expenses | $ | $ 94,724 | 83,778 |  |  |
Long-term Incentive Plan 2009 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Ownership percentage of class A units | 100.00% |  |  |  |
Performance Incentive Plan |  |  |  |  |
Number of shares authorized for issuance (in shares) |  |  |  | 8,900,000 | 8,000,000.0
Shares available for grant (in shares) | 2,400,000 |  |  |  |
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 | $ | $ 69,100 | $ 41,900 |  |  |
2013-2014 Performance Incentive Plan |  |  |  |  |
Performance Incentive Plan |  |  |  |  |
Points at beginning of period (in shares) | 81.17 |  |  |  |
Forfeited (in shares) | (1.00) |  |  |  |
Points at end of period (in shares) | 80.17 | 81.17 |  |  |
iPIP distributions to plan participants | $ |  | $ 7,400 |  |  |
iPIP distributions, equity component (in shares) |  | 389,545 |  |  |
iPIP distributions, equity component, fair value (in dollars per share) | $ / shares |  | $ 9.21 |  |  |
iPIP distributions, shares issued net of tax withholdings (in shares) |  | 209,118 |  |  |
2019-2020 Performance Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of ownership classes of consolidated subsidiary | ownership_class | 2 |  |  |  |
Equity-based compensation | $ | $ 3,400 | $ 2,900 |  |  |
Settlement or distribution on units and awards, cash | 50.00% |  |  |  |
Settlement or distribution on units and awards, common stock | 50.00% |  |  |  |
2015-2016 Performance Incentive Plan |  |  |  |  |
Performance Incentive Plan |  |  |  |  |
Points at beginning of period (in shares) | 73.28 |  |  |  |
Forfeited (in shares) | (2.88) |  |  |  |
Points at end of period (in shares) | 70.40 | 73.28 |  |  |
iPIP distributions to plan participants | $ | $ 1,500 | $ 9,400 |  |  |
iPIP distributions, equity component (in shares) | 54,245 | 356,065 |  |  |
iPIP distributions, equity component, fair value (in dollars per share) | $ / shares | $ 14.51 | $ 13.11 |  |  |
iPIP distributions, shares issued net of tax withholdings (in shares) | 32,825 | 192,829 |  |  |
2017-2018 Performance Incentive Plan |  |  |  |  |
Performance Incentive Plan |  |  |  |  |
Points at beginning of period (in shares) | 77.27 |  |  |  |
Forfeited (in shares) | (3.93) |  |  |  |
Points at end of period (in shares) | 73.34 | 77.27 |  |  |
2013-2018 Performance Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Equity-based compensation | $ | $ 30,700 | $ 21,200 | $ 15,000 |  |
Settlement or distribution on units and awards, cash | 50.00% |  |  |  |
Settlement or distribution on units and awards, common stock | 50.00% |  |  |  |

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