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Mortgage and Other Indebtedness, Net (Schedule of Mortgage and Other Indebtedness) (Details) - USD ($) $ in Thousands		1 Months Ended	9 Months Ended
	Sep. 01, 2017	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Fixed-rate debt, Amount		$ 3,170,000	$ 3,170,000		$ 3,594,379
Variable-rate debt, Amount		1,065,450	1,065,450		888,770
Total fixed-rate and variable-rate debt		$ 4,235,450	$ 4,235,450		$ 4,483,149
Weighted- Average Interest Rate		4.72%	4.72%		4.82%
Unamortized deferred financing costs		$ (19,272)	$ (19,272)		$ (17,855)
Total mortgage and other indebtedness, net		$ 4,216,178	4,216,178		$ 4,465,294
Additional debt issued			$ 1,097,006	$ 614,671
Variable Rate Interest
Debt Instrument [Line Items]
Weighted- Average Interest Rate		2.77%	2.77%		2.15%
Fixed Rate Interest
Debt Instrument [Line Items]
Weighted- Average Interest Rate		5.37%	5.37%		5.48%
Non-recourse loans on operating properties
Debt Instrument [Line Items]
Fixed-rate debt, Amount		$ 1,807,519	$ 1,807,519		$ 2,453,628
Variable-rate debt, Amount		$ 10,868	$ 10,868		$ 19,055
Non-recourse loans on operating properties | Variable Rate Interest
Debt Instrument [Line Items]
Weighted- Average Interest Rate		3.04%	3.04%		3.13%
Non-recourse loans on operating properties | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted- Average Interest Rate		5.34%	5.34%		5.55%
Senior Notes Due 2023
Debt Instrument [Line Items]
Fixed-rate debt, Amount		$ 446,868	$ 446,868		$ 446,552
Unamortized debt discount		$ 3,132	$ 3,132		$ 3,448
Senior Notes Due 2023 | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted- Average Interest Rate		5.25%	5.25%		5.25%
Senior Notes Due 2024
Debt Instrument [Line Items]
Fixed-rate debt, Amount		$ 299,944	$ 299,944		$ 299,939
Unamortized debt discount		$ 56	$ 56		$ 61
Senior Notes Due 2024 | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted- Average Interest Rate		4.60%	4.60%		4.60%
Senior Notes Due 2026
Debt Instrument [Line Items]
Fixed-rate debt, Amount		$ 615,669	$ 615,669		$ 394,260
Unamortized debt discount		9,331	$ 9,331		$ 5,740
Additional debt issued	$ 225,000	$ 225,000
Senior Notes Due 2026 | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted- Average Interest Rate		5.95%	5.95%		5.95%
Recourse term loans on operating properties
Debt Instrument [Line Items]
Variable-rate debt, Amount		$ 89,612	$ 89,612		$ 24,428
Recourse term loans on operating properties | Variable Rate Interest
Debt Instrument [Line Items]
Weighted- Average Interest Rate		3.87%	3.87%		3.29%
Construction loan
Debt Instrument [Line Items]
Variable-rate debt, Amount		$ 0	$ 0		$ 39,263
Construction loan | Variable Rate Interest
Debt Instrument [Line Items]
Weighted- Average Interest Rate		0.00%	0.00%		3.12%
Unsecured lines of credit
Debt Instrument [Line Items]
Variable-rate debt, Amount		$ 79,970	$ 79,970		$ 6,024
Unsecured lines of credit | Variable Rate Interest
Debt Instrument [Line Items]
Weighted- Average Interest Rate		2.43%	2.43%		1.82%
Unsecured term loans
Debt Instrument [Line Items]
Variable-rate debt, Amount		$ 885,000	$ 885,000		$ 800,000
Unsecured term loans | Variable Rate Interest
Debt Instrument [Line Items]
Weighted- Average Interest Rate		2.69%	2.69%		2.04%

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