Mortgage and Other Indebtedness, Net - Debt of Operating Partnership (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Mortgage notes payable	$ 963,118	$ 1,120,203
Mortgage and other indebtedness, variable-rate debt	27,461	68,061
Total fixed-rate and variable-rate debt	990,579	1,188,264
Unamortized deferred financing costs	(2,987)	(3,433)
Total mortgage and other indebtedness, net	$ 987,592	$ 1,184,831
Weighted average interest rate (as a percent)	5.01%	5.10%
Mortgage notes payable subject to compromise	$ 1,375,000	$ 1,375,000
Mortgage and other indebtedness, variable-rate debt, subject to compromise	1,154,138	1,114,676
Total fixed-rate and variable-rate debt	2,529,138	2,489,676
Unpaid accrued interest	58,370	57,644
Total liabilities subject to compromise	$ 2,591,706	$ 2,551,490
Weighted average interest rate subject to compromise (as a percent)	7.23%	7.25%
Senior Secured Facility
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	5.00%
Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	5.07%	5.12%
Weighted average interest rate subject to compromise (as a percent)	5.43%	5.43%
Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	2.99%	4.69%
Weighted average interest rate subject to compromise (as a percent)	9.37%	9.50%
Post-Default Rate \| Senior Secured Facility
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	9.50%	9.50%
Non-Recourse Loans on Operating Properties
Debt Instrument [Line Items]
Mortgage notes payable	$ 963,118	$ 1,120,203
Non-Recourse Loans on Operating Properties \| Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	5.07%	5.12%
Recourse Loans on Operating Properties
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt	$ 27,461	$ 68,061
Recourse Loans on Operating Properties \| Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	2.99%	4.69%
Senior Unsecured Notes Due 2023
Debt Instrument [Line Items]
Mortgage notes payable subject to compromise	$ 450,000	$ 450,000
Senior Unsecured Notes Due 2023 \| Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	5.25%
Weighted average interest rate subject to compromise (as a percent)	5.25%	5.25%
Senior Unsecured Notes Due 2024
Debt Instrument [Line Items]
Mortgage notes payable subject to compromise	$ 300,000	$ 300,000
Senior Unsecured Notes Due 2024 \| Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	4.60%
Weighted average interest rate subject to compromise (as a percent)	4.60%	4.60%
Senior Unsecured Notes Due 2026
Debt Instrument [Line Items]
Mortgage notes payable subject to compromise	$ 625,000	$ 625,000
Senior Unsecured Notes Due 2026 \| Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	5.95%
Weighted average interest rate subject to compromise (as a percent)	5.95%	5.95%
Secured Line of Credit
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt, subject to compromise	$ 675,926	$ 675,926
Total liabilities subject to compromise	$ 675,926	$ 675,926
Secured Line of Credit \| Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate subject to compromise (as a percent)	9.50%	9.50%
Secured Term Loan
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt, subject to compromise	$ 438,750	$ 438,750
Total liabilities subject to compromise	$ 438,750	$ 438,750
Secured Term Loan \| Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate subject to compromise (as a percent)	9.50%	9.50%
Recourse Loan on Operating Property
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt, subject to compromise	$ 39,462
Recourse Loan on Operating Property \| Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate subject to compromise (as a percent)	5.76%
Prepetition Unsecured Or Under Secured Liabilities
Debt Instrument [Line Items]
Total liabilities subject to compromise	$ 4,198	$ 4,170
Certain Property-level, Non-recourse Mortgage Loans
Debt Instrument [Line Items]
Unamortized deferred financing costs	2,624
Recourse and Nonrecourse Term Loans
Debt Instrument [Line Items]
Secured non-recourse and recourse term loans	$ 2,154,326

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Long term debt net excluding deferred financing costs subject to compromise.

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Long term debt percentage bearing fixed interest amount subject to compromise.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Interest rate on outstanding borrowings under debtor-in-possession financing arrangement.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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