Consolidated Statements of Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Noncontrolling Interests	Series I Preferred Stock Preferred Stock
Beginning Balance at Dec. 31, 2013	$ 7,016,876	$ 986	$ 5,015,904	$ (317,356)	$ (15,211)	$ 1,619,150	$ 491,471	$ 221,932
Shares outstanding (shares) at Dec. 31, 2013		94,993,000
Increase (Decrease) in Stockholders' Equity
Net income	392,439					389,106	3,333
Other comprehensive income	9,015				9,015
Preferred dividends	(7,475)					(7,475)
DRIP proceeds	26		26
Conversion of units of the Operating Partnership to common stock	23,066	2	23,064
Conversion of units of the Operating Partnership to common stock (in shares)		233,000
Reallocation of noncontrolling interest in the Operating Partnership	(107,925)					(107,925)
Deferred compensation plan and stock award, net	(1,390)	0	1,406	(2,796)
Deferred compensation plan and stock award, net (in shares)		2,000
Amortization of deferred compensation plan	17,069		17,069
Issuance of common stock	8,750	1	8,749
Issuance of common stock (shares)		82,000
Proceeds from stock options exercised	19,751	4	19,747
Proceeds from issuance of common stock (in shares)		277,000
Contributions to consolidated joint venture interest	1,673						1,673
Cash distributions to noncontrolling interests	(4,352)						(4,352)
Cash distributions declared ($1.00 per common share, none of which represented a return of capital for federal income tax purposes)	(95,276)					(95,276)
Ending Balance at Jun. 30, 2014	$ 7,272,247	$ 993	$ 5,085,965	$ (320,152)	$ (6,196)	$ 1,797,580	$ 492,125	$ 221,932
Shares outstanding (shares) at Jun. 30, 2014		95,587,000