Condensed Consolidated Statement of Equity - 6 months ended Jun. 30, 2016 - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Dividends in Excess of Earnings	Accumulated Other Comprehensive Loss, Net	Total Stockholders’ Equity	Noncontrolling Interests in Operating Partnership	Noncontrolling Interests in Consolidated Joint Ventures	Total Noncontrolling Interests
Balance 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 (shares) at Dec. 31, 2015			146,384,247
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of units to common stock			$ 4	3,822			3,826	(3,826)		(3,826)
Conversion of units to common stock (shares)			320,993
Issuance of unvested restricted stock, net of forfeitures (shares)			112,556
Common stock offering costs, net	3,107			3,107			3,107
Exercise of stock options	$ 1,255			1,255			1,255
Exercise of stock options (shares)	30,945		30,945
Shares issued under employee stock purchase plan	$ 658			658			658
Shares issued under employee stock purchase plan (shares)			10,326
Preferred stock offering costs	(2)	(2)					(2)
Amortization of share-based compensation	12,664			12,664			12,664
Reclassification of vested share-based awards				(7,577)			(7,577)	7,577		7,577
Dividends declared on preferred stock	(44,848)				(44,848)		(44,848)
Dividends and distributions on common stock and common and incentive units	(263,094)				(258,252)		(258,252)	(4,842)		(4,842)
Distributions to noncontrolling interests in consolidated joint ventures, net of contributions	(264)								(264)	(264)
Net income	113,277				111,924		111,924	1,120	233	1,353
Other comprehensive income—foreign currency translation adjustments	(18,950)					(18,644)	(18,644)	(306)		(306)
Other comprehensive loss—fair value of interest rate swaps	(16,919)					(16,642)	(16,642)	(277)		(277)
Other comprehensive income—reclassification of accumulated other comprehensive loss to interest expense	2,256					2,219	2,219	37		37
Balance at Jun. 30, 2016	$ 4,325,642	$ 1,290,133	$ 1,460	$ 4,669,149	$ (1,541,265)	$ (129,657)	$ 4,289,820	$ 29,095	$ 6,727	$ 35,822
Balance (shares) at Jun. 30, 2016			146,859,067