Mortgage and Other Indebtedness, Net - Senior Unsecured Notes, Unsecured Lines of Credit and Unsecured Term Loans (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	6.51%	5.02%
Minimum
Debt Instrument [Line Items]
Notice required to redeem debt	30 days
Maximum
Debt Instrument [Line Items]
Notice required to redeem debt	60 days
Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	5.31%	5.35%
Senior Unsecured Notes Due 2023
Debt Instrument [Line Items]
Balance of non-recourse debt	$ 450,000
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 2023 | Treasury Rate
Debt Instrument [Line Items]
Basis spread on variable interest rate (as a percent)	0.40%
Senior Unsecured Notes Due 2024
Debt Instrument [Line Items]
Balance of non-recourse debt	$ 300,000
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 2024 | Treasury Rate
Debt Instrument [Line Items]
Basis spread on variable interest rate (as a percent)	0.35%
Senior Unsecured Notes Due 2026
Debt Instrument [Line Items]
Balance of non-recourse debt	$ 625,000
Senior Unsecured Notes Due 2026 | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	5.95%	5.95%
Senior Unsecured Notes Due 2026 | Treasury Rate
Debt Instrument [Line Items]
Basis spread on variable interest rate (as a percent)	0.50%