Net Income Available to Common Stockholders Per Share of the Company (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011		Dec. 31, 2011
Numerator:
Income from continuing operations	$ 4,962		$ 1,844
Loss from continuing operations attributable to noncontrolling common units of the Operating Partnership	114		61
Preferred distributions and dividends	(9,336)		(3,799)
Allocation to participating securities (nonvested shares and time-based RSUs)	(380)		(322)
Numerator for basic and diluted (loss) income from continuing operations available to common stockholders	(4,640)		(2,216)
Income from discontinued operations	73,709	[1]	3,023	[1],[2]
Income from discontinued operations attributable to noncontrolling common units of the Operating Partnership	(1,909)		(95)
Numerator for basic and diluted net income available to common stockholders	$ 67,160		$ 712
Denominator:
Weighted average common shares outstanding-basic (Note 15)	63,648,704		52,302,075
Effect of dilutive securities - contingently issuable shares and stock options	0		0	[3]
Weighted average common shares outstanding-diluted	63,648,704		52,302,075
Basic earnings per share:
Loss from continuing operations available to common stockholders per common share-basic (Note 15)	$ (0.07)		$ (0.04)
Income from discontinued operations per common share	$ 1.13		$ 0.05
Net income available to common stockholders per share-basic	$ 1.06		$ 0.01
Diluted earnings per share:
Loss from continuing operations available to common stockholders per common share-diluted (Note 15)	$ (0.07)		$ (0.04)
Income from discontinued operations per common share	$ 1.13		$ 0.05
Net income available to common stockholders per share-diluted	$ 1.06		$ 0.01
Stock options outstanding	1,550,000	[4],[5]			5,000	[6]
Market Measure-Based Restricted Stock Units (RSUs) [Member]
Diluted earnings per share:
Market measure-based RSUs	103,238

[1] See Note 14 for the breakdown of income from discontinued operations by segment.

[2] Includes two office and one industrial buildings encompassing 282,611 rentable square feet that were disposed of in 2011.

[3] Dilutive securities were not included in the current period presentation of the 2011 weighted average shares outstanding because we reported a net loss from continuing operations attributable to common stockholders for the three months ended March 31, 2011 resulting from the reclassification of the revenues and expenses of operating properties that were sold during 2011 and 2012.

[4] The total intrinsic value of options outstanding at March 31, 2012 was $6.2 million.

[5] As of March 31, 2012, none of the outstanding stock options were exercisable.

[6] Stock options outstanding as of December 31, 2011 were granted in 2002 and exercised in 2012 prior to expiration. No stock options were granted during 2003 through 2011.