Consolidated Statement of Equity - 9 months ended Sep. 30, 2016 - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid- In-Capital	Treasury Stock	Accumulated Other Comprehensive (Loss)	Retained Earnings	Noncontrolling Interests
Beginning Balance at Dec. 31, 2015	$ 7,719,317	$ 221,932	$ 1,001	$ 5,439,735	$ (10,000)	$ (8,749)	$ 1,643,546	$ 431,852
Beginning Balance (in shares) at Dec. 31, 2015			99,976
Increase (Decrease) in Stockholders' Equity
Net income	208,388						202,143	6,245
Other comprehensive loss	(5,325)					(5,325)
Preferred dividends	(11,213)						(11,213)
DRSPP proceeds (in shares)			1
DRSPP proceeds	146			146
Conversion of units of the Operating Partnership to common stock (in shares)			118
Conversion of units of the Operating Partnership to common stock	12,746		$ 1	12,745
Reallocation of noncontrolling interest in the Operating Partnership	(4,959)						(4,959)
Deferred compensation plan and stock award, net (in shares)			12
Deferred compensation plan and stock award, net	(2,086)			(2,086)
Amortization of deferred compensation plan	19,230			19,230
Issuance of common stock	(40)		$ 10	113,999	(114,049)
Proceeds from stock options exercised (in shares)			157
Proceeds from stock options exercised	12,258		$ 1	12,257
Contributions to consolidated joint venture interests	2,019							2,019
Cash distributions to noncontrolling interests	(11,023)							(11,023)
Cash distributions declared ($2.16 per common share, none of which represented a return of capital for federal income tax purposes)	(216,810)						(216,810)
Ending Balance at Sep. 30, 2016	$ 7,722,648	$ 221,932	$ 1,013	$ 5,596,026	$ (124,049)	$ (14,074)	$ 1,612,707	$ 429,093
Ending Balance (in shares) at Sep. 30, 2016			100,264