CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Series A Cumulative Redeemable Preferred Stock Preferred Stock	Series A Cumulative Redeemable Preferred Stock Cumulative Dividends	Series A Cumulative Redeemable Preferred Stock	Series C Cumulative Convertible Redeemable Preferred Stock Cumulative Dividends	Series C Cumulative Convertible Redeemable Preferred Stock	Series D Cumulative Redeemable Preferred Stock Preferred Stock	Series D Cumulative Redeemable Preferred Stock Cumulative Dividends	Series D Cumulative Redeemable Preferred Stock	Common Stock	Additional Paid In Capital	Retained Earnings	Cumulative Dividends	Accumulated Other Comprehensive Loss	Noncontrolling Interests in Consolidated Joint Ventures	Total
Beginning Balance at Dec. 31, 2012	$ 176,250					$ 115,000			$ 1,352	$ 1,493,397	$ 158,252	$ (475,144)	$ (5,335)	$ 55,541	$ 1,519,313
Beginning Balance (in shares) at Dec. 31, 2012	7,050,000					4,600,000			135,237,438
Increase (Decrease) in Stockholders' Equity
Net proceeds from sale of common stock									$ 453	565,307					565,760
Net proceeds from sale of common stock (in shares)									45,300,000
Vesting of restricted common stock									$ 4	5,247					5,251
Vesting of restricted common stock (in shares)									321,261
Redemptions of Series A and Series C preferred stock	$ (176,250)									4,770		(4,770)			(176,250)
Redemptions of Series A and Series C preferred stock (in shares)	(7,050,000)
Distributions to noncontrolling interests														(5,481)	(5,481)
Common stock dividends and dividends payable												(17,287)			(17,287)
Preferred stock dividends and dividends payable		$ (2,350)	$ (2,350)	$ (2,693)	$ (2,693)		$ (9,200)	$ (9,200)
Net income											65,988			4,013	70,001
Pension liability reclassification													$ 5,335		5,335
Ending Balance at Dec. 31, 2013						$ 115,000			$ 1,809	2,068,721	224,240	(511,444)		54,073	1,952,399
Ending Balance (in shares) at Dec. 31, 2013						4,600,000			180,858,699
Increase (Decrease) in Stockholders' Equity
Net proceeds from sale of common stock									$ 194	283,262					283,456
Net proceeds from sale of common stock (in shares)									19,352,703
Issuance of common stock in connection with hotel acquisition, net									$ 40	59,894					59,934
Issuance of common stock in connection with hotel acquisition, net (in shares)									4,034,970
Vesting of restricted common stock									$ 5	6,690					6,695
Vesting of restricted common stock (in shares)									520,346
Distributions to noncontrolling interests														(8,488)	(8,488)
Cash and/or stock common stock dividends and dividends payable												(103,901)			(103,901)
Preferred stock dividends and dividends payable							(9,200)	(9,200)
Net income											81,263			6,676	87,939
Ending Balance at Dec. 31, 2014						$ 115,000			$ 2,048	2,418,567	305,503	(624,545)		52,261	2,268,834
Ending Balance (in shares) at Dec. 31, 2014						4,600,000			204,766,718
Increase (Decrease) in Stockholders' Equity
Vesting of restricted common stock									$ 7	2,840					2,847
Vesting of restricted common stock (in shares)									710,108
Distributions to noncontrolling interests														(9,981)	(9,981)
Sale of noncontrolling interest														(125)	(125)
Issuance of common stock dividends									$ 21	37,328					37,349
Issuance of common stock dividends (in shares)									2,127,565
Cash and/or stock common stock dividends and dividends payable												(294,123)			(294,123)
Preferred stock dividends and dividends payable							$ (9,200)	$ (9,200)
Net income											347,355			8,164	355,519
Ending Balance at Dec. 31, 2015						$ 115,000			$ 2,076	$ 2,458,735	$ 652,858	$ (927,868)		$ 50,319	$ 2,351,120
Ending Balance (in shares) at Dec. 31, 2015						4,600,000			207,604,391