Mortgage and Other Indebtedness, Net - Debt of Operating Partnership (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Mortgage notes payable	$ 2,601,849,000	$ 2,695,888,000
Mortgage and other indebtedness, variable-rate debt	1,203,075,000	847,275,000
Total fixed-rate and variable-rate debt	3,804,924,000	3,543,163,000
Unamortized deferred financing costs	(15,232,000)	(16,148,000)
Mortgage and other indebtedness, net	$ 3,789,692,000	$ 3,527,015,000
Weighted average interest rate (as a percent)	4.85%	5.02%
Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	5.31%	5.35%
Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	3.86%	3.98%
Non-Recourse Loans on Operating Properties
Debt Instrument [Line Items]
Mortgage notes payable	$ 1,236,179,000	$ 1,330,561,000
Non-Recourse Loans on Operating Properties \| Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	5.19%	5.27%
Senior unsecured notes due 2023
Debt Instrument [Line Items]
Mortgage notes payable	$ 448,016,000	$ 447,894,000
Debt Instrument Unamortized Discount	$ 1,984,000	$ 2,106,000
Senior unsecured notes due 2023 \| Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	5.25%	5.25%
Senior unsecured notes due 2024
Debt Instrument [Line Items]
Mortgage notes payable	$ 299,962,000	$ 299,960,000
Debt Instrument Unamortized Discount	$ 38,000	$ 40,000
Senior unsecured notes due 2024 \| Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	4.60%	4.60%
Senior unsecured notes due 2026
Debt Instrument [Line Items]
Mortgage notes payable	$ 617,692,000	$ 617,473,000
Debt Instrument Unamortized Discount	$ 7,308,000	$ 7,527,000
Senior unsecured notes due 2026 \| Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	5.95%	5.95%
Recourse loans on operating Properties
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt	$ 41,500,000	$ 41,950,000
Recourse loans on operating Properties \| Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	4.23%	4.34%
Construction loan
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt	$ 29,400,000	$ 29,400,000
Construction loan \| Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	4.42%	4.60%
Secured Line of Credit
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt	$ 675,925,000	$ 310,925,000
Weighted average interest rate (as a percent)	3.83%	3.94%
Unsecured Debt [Member]
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt	$ 456,250,000	$ 465,000,000
Secured Term Loan
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	3.83%	3.94%
Recourse and Nonrecourse Term Loans
Debt Instrument [Line Items]
Secured non-recourse and recourse term loans	$ 2,422,116,000

Long Term Debt, Net Excluding Deferred Financing Costs

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Amount, after accumulated amortization, of debt discount.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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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