CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	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	Non-Controlling Interest in Consolidated Joint Ventures	Total
Beginning Balance at Dec. 31, 2011	$ 176,250					$ 115,000			$ 1,173	$ 1,312,566	$ 110,580	$ (445,396)	$ (4,916)	$ 60,037	$ 1,325,294
Beginning Balance (in shares) at Dec. 31, 2011	7,050,000					4,600,000			117,265,090
Increase (Decrease) in Stockholders' Equity
Net proceeds from sale of common stock									121	126,058					126,179
Net proceeds from sale of common stock (in shares)									12,143,273
Issuance of common stock in connection with hotel acquisition, net									55	51,008					51,063
Issuance of common stock in connection with hotel acquisition, net (in shares)									5,454,164
Vesting of restricted common stock									3	3,765					3,768
Vesting of restricted common stock (in shares)									374,911
Distributions to non-controlling interests														(6,381)	(6,381)
Preferred dividends and dividends payable		(14,100)	(14,100)	(6,448)	(6,448)		(9,200)	(9,200)
Net income											47,796			1,761	49,557
Pension liability adjustment													(419)		(419)
Ending Balance at Dec. 31, 2012	176,250					115,000			1,352	1,493,397	158,376	(475,144)	(5,335)	55,417	1,519,313
Ending 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 non-controlling interests														(5,481)	(5,481)
Cash common stock dividends and dividends payable												(17,287)			(17,287)
Preferred 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	224,364	(511,444)		53,949	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 non-controlling interests														(8,488)	(8,488)
Cash and/or stock common stock dividends and dividends payable												(103,901)			(103,901)
Preferred 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	$ 305,627	$ (624,545)		$ 52,137	$ 2,268,834
Ending Balance (in shares) at Dec. 31, 2014						4,600,000			204,766,718