Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include property accounts payable, legal liabilities, loan costs, general and administrative liabilities, but exclude interest.

No definition available.

Stock-Based Compensation Plans and Employee Benefits (Performance Incentive Plans) (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	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