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Mortgage and Other Indebtedness, Net - Mortgage and Other Indebtedness (Details)	9 Months Ended
	Sep. 30, 2018 USD ($) extension_option	Jun. 04, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Fixed-rate debt, Amount	$ 3,160,776,000		$ 3,158,973,000
Variable-rate debt, Amount	970,508,000		1,090,810,000
Total fixed-rate and variable-rate debt	$ 4,131,284,000		$ 4,249,783,000
Weighted-average interest rate (as a percent)	5.04%		4.74%
Unamortized deferred financing costs	$ (15,476,000)		$ (18,938,000)
Total mortgage and other indebtedness, net	$ 4,115,808,000		$ 4,230,845,000
Fixed Rate Interest
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)	5.37%		5.37%
Variable Rate Interest
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)	3.95%		2.90%
Unsecured Term Loan
Debt Instrument [Line Items]
Face amount of debt instrument	$ 695,000,000
Variable-rate debt, Amount	$ 695,000,000		$ 885,000,000
Unsecured Term Loan | Variable Rate Interest
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)	3.96%		2.81%
Non-recourse loans on operating properties
Debt Instrument [Line Items]
Face amount of debt instrument		$ 43,716,000
Fixed-rate debt, Amount	$ 1,797,080,000		$ 1,796,203,000
Variable-rate debt, Amount	$ 0		$ 10,836,000
Non-recourse loans on operating properties | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)	5.33%		5.33%
Non-recourse loans on operating properties | Variable Rate Interest
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)	0.00%		3.37%
Senior Notes Due 2023
Debt Instrument [Line Items]
Face amount of debt instrument	$ 450,000,000
Fixed-rate debt, Amount	447,309,000		$ 446,976,000
Unamortized debt discount	$ 2,691,000		$ 3,024,000
Senior Notes Due 2023 | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)	5.25%		5.25%
Senior Notes Due 2024
Debt Instrument [Line Items]
Face amount of debt instrument	$ 300,000,000
Fixed-rate debt, Amount	299,951,000		$ 299,946,000
Unamortized debt discount	$ 49,000		$ 54,000
Senior Notes Due 2024 | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)	4.60%		4.60%
Senior Notes Due 2026
Debt Instrument [Line Items]
Face amount of debt instrument	$ 625,000,000
Fixed-rate debt, Amount	616,436,000		$ 615,848,000
Unamortized debt discount	$ 8,564,000		$ 9,152,000
Senior 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]
Variable-rate debt, Amount	$ 74,150,000		$ 101,187,000
Recourse loans on operating properties | Variable Rate Interest
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)	4.73%		4.00%
Unsecured lines of credit
Debt Instrument [Line Items]
Variable-rate debt, Amount	$ 201,358,000		$ 93,787,000
Unsecured lines of credit | Variable Rate Interest
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)	3.65%		2.56%
Unsecured Term Loan 2
Debt Instrument [Line Items]
Face amount of debt instrument	$ 350,000,000
Variable rate (as a percent)	1.75%
Interest rate (as a percent)	3.85%
Unsecured Term Loan 1
Debt Instrument [Line Items]
Face amount of debt instrument	$ 300,000,000
Variable rate (as a percent)	2.00%
Interest rate (as a percent)	4.10%
Number of extension options available | extension_option	2
Option extension term of debt instrument	1 year
Unsecured Term Loan 3
Debt Instrument [Line Items]
Face amount of debt instrument	$ 45,000,000
Variable rate (as a percent)	1.65%
Interest rate (as a percent)	3.75%

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