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	12 Months Ended
	Dec. 31, 2019 USD ($) ownership_class $ / shares shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($)	May 03, 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 \| $	$ 30,436	$ 17,563	$ 18,812
Performance Incentive Plan
Accrued expenses \| $	$ 83,778	95,149
iPIP Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	6 years
Performance Incentive Plan
Accrued expenses \| $	$ 41,900	$ 37,500
2013-2014 Performance Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage	40.00%
Equity-based compensation \| $	$ 2,900
Settlement or distribution on units and awards, cash (percent)	50.00%
Settlement or distribution on units and awards, common stock (percent)	50.00%
Performance Incentive Plan
Points at beginning of period (in shares)	85.77
Granted (in shares)	0
Forfeited (in shares)	(4.60)
Points at end of period (in shares)	81.17	85.77
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
2015-2016 Performance Incentive Plan
Performance Incentive Plan
Points at beginning of period (in shares)	79.41
Granted (in shares)	0
Forfeited (in shares)	(6.13)
Points at end of period (in shares)	73.28	79.41
iPIP distributions to plan participants \| $	$ 9,400
iPIP distributions, equity component (in shares)	356,065
iPIP distributions, equity component, fair value (in dollars per share) \| $ / shares	$ 13.11
iPIP distributions, shares issued net of tax withholdings (in shares)	192,829
2017-2018 Performance Incentive Plan
Performance Incentive Plan
Points at beginning of period (in shares)	82.43
Granted (in shares)	0
Forfeited (in shares)	(5.16)
Points at end of period (in shares)	77.27	82.43
Long-term Incentive Plan 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ownership percentage of class A units (percent)	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)	2,800,000