Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation

Fair Value, Measurement Inputs, Disclosure

(Amounts in thousands)		As of December 31, 2016
		Total		Level 1		Level 2		Level 3
Marketable securities		$	203,704	$	203,704	$	-	$	-
Real estate fund investments			462,132		-		-		462,132
Deferred compensation plan assets (included in other assets)			121,374		63,930		-		57,444
Interest rate swaps (included in other assets)			21,816		-		21,816		-
	Total assets	$	809,026	$	267,634	$	21,816	$	519,576
Mandatorily redeemable instruments (included in other liabilities)		$	50,561	$	50,561	$	-	$	-
Interest rate swap (included in other liabilities)			10,122		-		10,122		-
	Total liabilities	$	60,683	$	50,561	$	10,122	$	-
(Amounts in thousands)		As of December 31, 2015
		Total		Level 1		Level 2		Level 3
Marketable securities		$	150,997	$	150,997	$	-	$	-
Real estate fund investments			574,761		-		-		574,761
Deferred compensation plan assets (included in other assets)			117,475		58,289		-		59,186
	Total assets	$	843,233	$	209,286	$	-	$	633,947
Mandatorily redeemable instruments (included in other liabilities)		$	50,561	$	50,561	$	-	$	-
Interest rate swaps (included in other liabilities)			19,600		-		19,600		-
	Total liabilities	$	70,161	$	50,561	$	19,600	$	-

Schedule Of Carrying Amounts And Fair Values Of Financial Instruments

(Amounts in thousands)			As of December 31, 2016				As of December 31, 2015
			Carrying		Fair		Carrying		Fair
			Amount		Value		Amount		Value
Cash equivalents			$	1,307,105	$	1,307,000	$	1,295,980	$	1,296,000
Debt:
	Mortgages payable		$	9,374,297	$	9,356,000	$	9,614,838	$	9,306,000
	Senior unsecured notes			850,000		899,000		850,000		868,000
	Unsecured term loan			375,000		375,000		187,500		187,500
	Unsecured revolving credit facilities			115,630		116,000		550,000		550,000
		Total	$	10,714,927	$	10,746,000	$	11,202,338	$	10,911,500

Real estate fund investments

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation

Fair value inputs quantitative information

			Weighted Average
			(based on fair
Unobservable Quantitative Input		Range	value of investments)
	Discount rates	10.0% to 14.9%	12.6%
	Terminal capitalization rates	4.3% to 5.8%	5.3%

Summary of Changes in Level 3 Plan Assets

(Amounts in thousands)	For The Year Ended December 31,
	2016		2015
Beginning balance	$	574,761	$	513,973
Purchases		-		95,010
Dispositions/distributions		(71,888)		(91,450)
Net unrealized (loss) gain		(41,162)		54,995
Net realized gain		507		2,757
Other, net		(86)		(524)
Ending balance	$	462,132	$	574,761

Deferred Compensation Plan Assets

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation

Summary of Changes in Level 3 Plan Assets

(Amounts in thousands)	For The Year Ended December 31,
	2016		2015
Beginning balance	$	59,186	$	63,315
Purchases		5,355		9,062
Sales		(9,354)		(13,252)
Realized and unrealized gains (losses)		344		(501)
Other, net		1,913		562
Ending balance	$	57,444	$	59,186