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Stock-Based Compensation Plans and Employee Benefits - Performance Incentive Plans (Details) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) shares	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) ownership_class $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Dec. 31, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation | $	$ 5,661	$ 6,740	$ 26,675	$ 20,694
Performance Incentive Plan
Accrued expenses | $	84,742		$ 84,742		$ 83,778
iPIP Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			6 years
Performance Incentive Plan
Accrued expenses | $	$ 58,600		$ 58,600		$ 41,900
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
Ownership percentage of class A units (as a percent)			100.00%
Equity-based compensation | $			$ 2,500	2,000
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%
2013-2018 Performance Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation | $			$ 20,200	14,100
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		80.17
Forfeited (in shares)			(1.00)
Points at end of period (in shares)			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
2015-2016 Performance Incentive Plan
Performance Incentive Plan
Points at beginning of period (in shares)	70.40		70.40
Forfeited (in shares)			(2.88)
Points at end of period (in shares)			73.28
iPIP distributions to plan participants | $			$ 1,500
iPIP distributions, equity component (in shares)			54,245
iPIP distributions, equity component, fair value (in dollars per share) | $ / shares			$ 14.51
iPIP distributions, shares issued net of tax withholdings (in shares)			32,825
2017-2018 Performance Incentive Plan
Performance Incentive Plan
Points at beginning of period (in shares)	73.34		73.34
Forfeited (in shares)			(3.93)
Points at end of period (in shares)			77.27
Vesting at end of second year | iPIP Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage			40.00%
Vesting at end of third year | iPIP Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage			15.00%
Vesting at end of fourth year | iPIP Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage			15.00%
Vesting at end of fifth year | iPIP Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage			15.00%
Vesting at end of sixth year | iPIP Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage			15.00%

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