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MORTGAGE AND OTHER INDEBTEDNESS, NET (Debt of Operating Partnership) (Details)		1 Months Ended
	Sep. 01, 2017 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) loan	Jul. 31, 2017 loan	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Loan, outstanding amount			$ 3,158,973,000		$ 3,594,379,000
Mortgage and other indebtedness, variable-rate debt			1,090,810,000		888,770,000
Total fixed-rate and variable-rate debt			4,249,783,000		4,483,149,000
Deferred financing costs			(18,938,000)		(17,855,000)
Mortgage and other indebtedness			$ 4,230,845,000		$ 4,465,294,000
Weighted average interest rate			4.74%		4.82%
Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate			5.37%		5.48%
Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate			2.90%		2.15%
Non Recourse Loans On Operating Properties
Debt Instrument [Line Items]
Loan, outstanding amount			$ 1,796,203,000		$ 2,453,628,000
Mortgage and other indebtedness, variable-rate debt			$ 10,836,000		$ 19,055,000
Non Recourse Loans On Operating Properties | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate			5.33%		5.55%
Non Recourse Loans On Operating Properties | Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate			3.37%		3.13%
Senior unsecured notes due 2023
Debt Instrument [Line Items]
Loan, outstanding amount			$ 446,976,000		$ 446,552,000
Debt instrument, face value			$ 450,000,000
Senior unsecured notes due 2023 | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate			5.25%		5.25%
Senior unsecured notes due 2024
Debt Instrument [Line Items]
Loan, outstanding amount			$ 299,946,000		$ 299,939,000
Debt instrument, unamortized discount			54,000		$ 61,000
Debt instrument, face value			$ 300,000,000
Senior unsecured notes due 2024 | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate			4.60%		4.60%
Senior unsecured notes due 2026
Debt Instrument [Line Items]
Loan, outstanding amount			$ 615,848,000		$ 394,260,000
Deferred financing costs		$ (1,879,000)
Debt instrument, unamortized discount		3,938,000	9,152,000		$ 5,740,000
Debt instrument, face value			$ 625,000,000
Proceeds from mortgage and other indebtedness	$ 225,000,000	$ 225,000,000
Senior unsecured notes due 2026 | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate			5.95%		5.95%
Recourse loans on operating Properties
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt			$ 101,187,000		$ 24,428,000
Recourse loans on operating Properties | Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate			4.00%		3.29%
Construction loan
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt			$ 0		$ 39,263,000
Construction loan | Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate			0.00%		3.12%
Unsecured lines of credit
Debt Instrument [Line Items]
Mortgage and other indebtedness, variable-rate debt			$ 93,787,000		$ 6,024,000
Unsecured lines of credit | Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate			2.56%		1.82%
Unsecured term loans
Debt Instrument [Line Items]
Number of debt instruments (loan) | loan			3	3
Mortgage and other indebtedness, variable-rate debt			$ 885,000,000		$ 800,000,000
Unsecured term loans | Variable Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate			2.81%		2.04%
Senior Unsecured Notes
Debt Instrument [Line Items]
Debt instrument, unamortized discount			$ 3,024,000		$ 3,448,000
Recourse and Nonrecourse Term Loans
Debt Instrument [Line Items]
Secured non-recourse and recourse term loans			$ 2,073,448,000

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