Consolidated Statement of Equity - 3 months ended Mar. 31, 2017 - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid- In-Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Noncontrolling Interests
Beginning Balance at Dec. 31, 2016	$ 7,750,911	$ 221,932	$ 1,017	$ 5,624,545	$ (124,049)	$ 22,137	$ 1,578,893	$ 426,436
Beginning Balance (in shares) at Dec. 31, 2016			100,562
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(2,402)							(17,491)
Other comprehensive loss	(5,626)					(5,626)
Preferred dividends	(3,738)						(3,738)
DRSPP proceeds (in shares)			1
DRSPP proceeds	56			56
Conversion of units of the Operating Partnership to common stock (in shares)			120
Conversion of units of the Operating Partnership to common stock	13,112		$ 1	13,111
Reallocation of noncontrolling interest in the Operating Partnership	(15,548)						(15,548)
Deferred compensation plan and stock award, net (in shares)			(10)
Deferred compensation plan and stock award, net	(1,963)			(1,963)
Amortization of deferred compensation plan	6,691			6,691
Proceeds from stock options exercised (in shares)			104
Proceeds from stock options exercised	8,752		$ 1	8,751
Contributions to consolidated joint venture interests	31,947							31,947
Cash distributions to noncontrolling interests	(469)							(469)
Cash distributions declared ($0.775 per common share, none of which represented a return of capital for federal income tax purposes)	(77,937)						(77,937)
Ending Balance at Mar. 31, 2017	$ 7,703,684	$ 221,932	$ 1,019	$ 5,651,089	$ (124,049)	$ 16,511	$ 1,496,759	$ 440,423
Ending Balance (in shares) at Mar. 31, 2017			100,776