Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]

Schedule of Fair Values of Financial Assets and Liabilities by Levels [Table Text Block]

			As of December 31, 2012
(Amounts in thousands)			Total		Level 1		Level 2		Level 3
	Marketable securities		$	398,188	$	398,188	$	-	$	-
	Real Estate Fund investments (75% of which is attributable to
		noncontrolling interests)		600,786		-		-		600,786
	Deferred compensation plan assets (included in other assets)			105,200		42,569		-		62,631
	J.C. Penney derivative position (included in other assets)⁽¹⁾			11,165		-		11,165		-
		Total assets	$	1,115,339	$	440,757	$	11,165	$	663,417

	Mandatorily redeemable instruments (included in other liabilities)		$	55,011	$	55,011	$	-	$	-
	Interest rate swap (included in other liabilities)			50,070		-		50,070		-
		Total liabilities	$	105,081	$	55,011	$	50,070	$	-


(1)		Represents the cash deposited with the counterparty in excess of the mark-to-market loss on the derivative position.

			As of December 31, 2011
(Amounts in thousands)			Total		Level 1		Level 2		Level 3
	Marketable securities		$	741,321	$	741,321	$	-	$	-
	Real Estate Fund investments (75% of which is attributable to
		noncontrolling interests)		346,650		-		-		346,650
	Deferred compensation plan assets (included in other assets)			95,457		39,236		-		56,221
	J.C. Penney derivative position (included in other assets)⁽¹⁾			30,600		-		30,600		-
		Total assets	$	1,214,028	$	780,557	$	30,600	$	402,871

	Mandatorily redeemable instruments (included in other liabilities)		$	54,865	$	54,865	$	-	$	-
	Interest rate swap (included in other liabilities)			41,114		-		41,114		-
		Total liabilities	$	95,979	$	54,865	$	41,114	$	-


(1)		Represents the mark-to-market gain on the derivative position.

Fair Value Inputs, Assets, Quantitative Information [Table Text Block]

			Weighted Average
			(based on fair
Unobservable Quantitative Input		Range	value of investments)
	Discount rates	12.5% to 19.0%	14.7%
	Terminal capitalization rates	5.3% to 6.3%	5.8%

Non-financial Assets Measured at Fair Value on a Nonrecurring Basis [Table Text Block]

			As of December 31, 2012
(Amounts in thousands)			Total		Level 1		Level 2		Level 3
	Investment in Toys"R" Us		$	478,041	$		$		$	478,041
	Real estate assets			189,529		-		-		189,529
	Condominium units (included in other assets)			52,142		-		-		52,142
		Total assets	$	719,712	$	-	$	-	$	719,712

			As of December 31, 2011
(Amounts in thousands)			Total		Level 1		Level 2		Level 3
	Real estate assets		$	62,033	$	-	$	-	$	62,033

Schedule Of Carrying Amounts And Fair Values Of Financial Instruments [Table Text Block]

			As of December 31, 2012				As of December 31, 2011
			Carrying		Fair		Carrying		Fair
(Amounts in thousands)			Amount		Value		Amount		Value
		Cash equivalents	$	543,000	$	543,000	$	-	$	-
		Mortgage and mezzanine loans receivable		225,359		221,446		133,948		128,581
			$	768,359	$	764,446	$	133,948	$	128,581
	Debt:
		Mortgages payable	$	8,768,182	$	8,795,000	$	8,072,880	$	8,188,000
		Senior unsecured notes		1,358,008		1,468,000		1,357,661		1,426,000
		Revolving credit facility debt		1,170,000		1,170,000		138,000		138,000
		Exchangeable senior debentures		-		-		497,898		510,000
		Convertible senior debentures		-		-		10,168		10,000
			$	11,296,190	$	11,433,000	$	10,076,607	$	10,272,000

Real Estate Fund Investments [Member]

Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]

Summary of Changes in Level 3 Plan Assets [Table Text Block]

	Real Estate Fund Investments
	For The Year Ended December 31,
(Amounts in thousands)	2012		2011
Beginning balance	$	346,650	$	144,423
Purchases		262,251		248,803
Sales/Returns		(63,762)		(48,355)
Realized gains		-		5,391
Unrealized gains		55,361		11,995
Other, net		286		(15,607)
Ending balance	$	600,786	$	346,650

Deferred Compensation Plan Assets [Member]

Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]

Summary of Changes in Level 3 Plan Assets [Table Text Block]

	Deferred Compensation Plan Assets
	For The Year Ended December 31,
(Amounts in thousands)	2012		2011
Beginning balance	$	56,221	$	47,850
Purchases		9,951		25,692
Sales		(8,367)		(18,801)
Realized and unrealized gains		4,703		1,232
Other, net		123		248
Ending balance	$	62,631	$	56,221

- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

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- Definition

Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 14

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

-Number 159

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-Subparagraph c(2), d, e, f

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-Publisher FASB

-Name Accounting Standards Codification

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

-Number 107

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-Subparagraph b-d

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-Name Statement of Financial Accounting Standard (FAS)

-Number 159

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-Subparagraph a, b, c(1), d(1)

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Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph a, c(1), c(2), c(3), d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

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