CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS EQUITY (USD $) In Thousands, unless otherwise specified	Total	Preferred Stock	Common Stock	Additional Paid-in- Capital	Distributions in Excess of Accumulated Earnings	Accumulated Other Comprehensive Loss	Treasury Shares At Cost	Noncontrolling Interest
Balance at Dec. 31, 2011	$ 1,072,595	$ 0	$ 911	$ 1,811,349	$ (633,854)	$ (11,712)	$ (140,018)	$ 45,919
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock, Net of Issuance Costs	134,436		109	134,327
Redemption of Preferred Stock	(50,044)			(48,240)	(1,804)
Stock Based Compensation Activity	4,582		6	6,220	(1,644)
Conversion of Units to Common Stock	0		5	4,758				(4,763)
Reallocation-Additional Paid in Capital	0			(1,924)				1,924
Preferred Dividends	(18,947)				(18,947)
Net Income (Loss)	(2,519)				(1,318)			(1,201)
Reallocation of Other Comprehensive Income	0					107		(107)
Other Comprehensive Income (Loss)	5,550					5,262		288
Balance at Dec. 31, 2012	1,145,653	0	1,031	1,906,490	(657,567)	(6,557)	(140,018)	42,274
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock, Net of Issuance Costs	173,785		107	173,678
Redemption of Preferred Stock	(150,051)			(144,384)	(5,667)
Stock Based Compensation Activity	4,532		4	5,476	(948)
Conversion of Units to Common Stock	0		1	995				(996)
Reallocation-Additional Paid in Capital	0			(3,369)				3,369
Common Stock and Unit Distributions	(38,862)				(37,288)			(1,574)
Preferred Dividends	(8,733)				(8,733)
Net Income (Loss)	41,428				40,307			1,121
Reallocation of Other Comprehensive Income	0					31		(31)
Other Comprehensive Income (Loss)	3,467					3,323		144
Balance at Dec. 31, 2013	1,171,219	0	1,143	1,938,886	(669,896)	(3,265)	(140,018)	44,369
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemption of Preferred Stock	(75,049)			(73,587)	(1,462)
Stock Based Compensation Activity	2,948		4	4,880	(1,936)
Conversion of Units to Common Stock	0		2	2,153				(2,155)
Reallocation-Additional Paid in Capital	0			4				(4)
Common Stock and Unit Distributions	(47,263)				(45,447)			(1,816)
Preferred Dividends	(1,019)				(1,019)
Net Income (Loss)	51,005				49,110			1,895
Reallocation of Other Comprehensive Income	0					16		(16)
Other Comprehensive Income (Loss)	(11,014)					(10,586)		(428)
Balance at Dec. 31, 2014	$ 1,090,827	$ 0	$ 1,149	$ 1,872,336	$ (670,650)	$ (13,867)	$ (140,018)	$ 41,877