Condensed Consolidated Statement Of Equity - 3 months ended Mar. 31, 2016 - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Dividends in Excess of Earnings	Accumulated other comprehensive income (loss), net	Total Stockholders’ Equity	Noncontrolling Interests in Operating Partnership	Noncontrolling Interests in Consolidated Joint Ventures	Total Noncontrolling Interests
Balance as of December 31, 2015 at Dec. 31, 2015	$ 4,536,502	$ 1,290,135	$ 1,456	$ 4,655,220	$ (1,350,089)	$ (96,590)	$ 4,500,132	$ 29,612	$ 6,758	$ 36,370
Balance as of December 31, 2015 (shares) at Dec. 31, 2015			146,384,247
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of units to common stock			$ 3	2,927			2,930	(2,930)		(2,930)
Conversion of units to common stock (shares)			252,521
Issuance of unvested restricted stock, net of forfeitures (shares)			122,209
Common stock offering costs, net	137			137			137
Exercise of stock options	$ 1,147			1,147			1,147
Exercise of stock options (shares)	28,345		28,345
Shares issued under employee stock purchase plan	$ 658			658			658
Shares issued under employee stock purchase plan			10,326
Amortization of share-based compensation	6,314			6,314			6,314
Reclassification of vested share-based awards				(6,919)			(6,919)	6,919		6,919
Dividends declared on preferred stock	(22,424)				(22,424)		(22,424)
Dividends and distributions on common stock and common and incentive units	(131,550)				(129,064)		(129,064)	(2,486)		(2,486)
Distributions to noncontrolling interests in consolidated joint ventures, net of contributions	(115)								(115)	(115)
Net income	62,333				61,549		61,549	663	121	784
Other comprehensive income—foreign currency translation adjustments	(1,441)					(1,417)	(1,417)	(24)		(24)
Other comprehensive loss—fair value of interest rate swaps	(7,409)					(7,285)	(7,285)	(124)		(124)
Other comprehensive income—reclassification of accumulated other comprehensive loss to interest expense	1,058					1,040	1,040	18		18
Balance as of March 31, 2016 at Mar. 31, 2016	$ 4,445,210	$ 1,290,135	$ 1,459	$ 4,659,484	$ (1,440,028)	$ (104,252)	$ 4,406,798	$ 31,648	$ 6,764	$ 38,412
Balance as of March 31, 2016 (shares) at Mar. 31, 2016			146,797,648