Consolidated Statement of Equity - 6 months ended Jun. 30, 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)	10,343						27,048	(16,705)
Other comprehensive loss	(7,783)					(7,783)
Preferred dividends	(7,475)						(7,475)
DRSPP proceeds (in shares)			1
DRSPP proceeds	111			111
Conversion of units of the Operating Partnership to common stock (in shares)			122
Conversion of units of the Operating Partnership to common stock	13,242		$ 1	13,241
Reallocation of noncontrolling interest in the Operating Partnership	(12,712)						(12,712)
Equity component of repurchased exchangeable senior notes	(18,824)			(18,824)
Deferred compensation plan and stock award, net (in shares)			(8)
Deferred compensation plan and stock award, net	(1,943)			(1,943)
Amortization of deferred compensation plan	15,487			15,487
Repurchase of common stock (in shares)			(2,448)
Repurchase of common stock	(253,197)		$ (24)	(253,173)
Proceeds from stock options exercised (in shares)			138
Proceeds from stock options exercised	11,595		$ 1	11,594
Contributions to consolidated joint venture interests	33,009							33,009
Deconsolidation of partially owned entity	(30,203)							(30,203)
Cash distributions to noncontrolling interests	(609)							(609)
Cash distributions declared ($1.55 per common share, none of which represented a return of capital for federal income tax purposes)	(154,312)						(154,312)
Ending Balance at Jun. 30, 2017	$ 7,347,640	$ 221,932	$ 995	$ 5,391,038	$ (124,049)	$ 14,354	$ 1,431,442	$ 411,928
Ending Balance (in shares) at Jun. 30, 2017			98,367