Consolidated Statement of Equity (Unaudited) - 9 months ended Sep. 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)	51,476						69,655	(18,179)
Other comprehensive loss	(7,952)					(7,952)
Preferred dividends	(11,213)						(11,213)
DRSPP proceeds (in shares)			2
DRSPP proceeds	185			185
Conversion of units of the Operating Partnership to common stock (in shares)			142
Conversion of units of the Operating Partnership to common stock	15,353		$ 1	15,352
Reallocation of noncontrolling interest in the Operating Partnership	2,669						2,669
Equity component of repurchased exchangeable senior notes	(27,969)			(27,969)
Deferred compensation plan and stock awards, net (in shares)			(6)
Deferred compensation plan and stock awards, net	(1,959)			(1,959)
Amortization of deferred compensation plan	22,014			22,014
Repurchases of common stock (in shares)			(3,400)
Repurchases of common stock	(349,991)		$ (34)	(349,957)
Proceeds from stock options exercised (in shares)			146
Proceeds from stock options exercised	12,290		$ 1	12,289
Contributions to consolidated joint venture interests	33,202							33,202
Deconsolidation of partially owned entity	(30,203)							(30,203)
Cash distributions to noncontrolling interests	(45,089)							(45,089)
Cash distributions declared ($2.325 per common share, none of which represented a return of capital for federal income tax purposes)	(229,672)						(229,672)
Ending Balance at Sep. 30, 2017	$ 7,184,052	$ 221,932	$ 985	$ 5,294,500	$ (124,049)	$ 14,185	$ 1,410,332	$ 366,167
Ending Balance (in shares) at Sep. 30, 2017			97,446