Consolidated Statement of Equity - 6 months ended Jun. 30, 2016 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid- In-Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Noncontrolling Interests
Beginning Balance at Dec. 31, 2015	$ 7,719,317	$ 1,001	$ 5,439,735	$ (10,000)	$ (8,749)	$ 1,643,546	$ 431,852
Beginning Balance (in shares) at Dec. 31, 2015		99,976,000
Increase (Decrease) in Stockholders' Equity
Net income	169,562					164,153	5,409
Other comprehensive loss	(7,809)				(7,809)
Preferred dividends	(7,475)					(7,475)
DRSPP proceeds (in shares)		1,000
DRSPP proceeds	89		89
Conversion of units of the Operating Partnership to common stock (in shares)		109,000
Conversion of units of the Operating Partnership to common stock	11,795	$ 1	11,794
Reallocation of noncontrolling interest in the Operating Partnership	(906)					(906)
Deferred compensation plan and stock award, net (in shares)		4,000
Deferred compensation plan and stock award, net	(2,150)		(2,150)
Amortization of deferred compensation plan	12,823		12,823
Issuance of common stock	(40)		(40)
Proceeds from stock options exercised (in shares)		74,000
Proceeds from stock options exercised	4,343	$ 1	4,342
Contributions to consolidated joint venture interests	1,434						1,434
Cash distributions to noncontrolling interests	(9,866)						(9,866)
Cash distributions declared ($1.44 per common share, none of which represented a return of capital for federal income tax purposes)	(143,998)					(143,998)
Ending Balance at Jun. 30, 2016	$ 7,747,119	$ 1,003	$ 5,466,593	$ (10,000)	$ (16,558)	$ 1,655,320	$ 428,829
Ending Balance (in shares) at Jun. 30, 2016		100,164,000