Net Income Available to Common Stockholders Per Share of the Company (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Numerator:
Income (loss) from continuing operations	$ 3,911	[1]	$ (665)	[1]	$ 36	[1]	$ 2,165	[1]	$ (16)	[1]	$ (3,391)	[1]	$ (1,071)	[1]	$ 750	[1]	$ 5,447	$ (3,728)	$ (427)
Loss (income) from continuing operations attributable to noncontrolling common units of the Operating Partnership																	383	545	468
Preferred dividends and distributions	(3,313)		(5,342)		(3,097)		(9,336)		(3,799)		(3,799)		(3,799)		(3,799)		(21,088)	(15,196)	(15,196)
Allocation to participating securities (nonvested shares and RSUs)																	(1,602)	(1,309)	(1,151)
Numerator for basic and diluted (loss) income from continuing operations available to common stockholders																	(16,860)	(19,688)	(16,306)
Income from discontinued operations	189,720	[1]	3,187	[1]	2,241	[1]	76,506	[1]	44,876	[1]	17,681	[1]	4,543	[1]	4,117	[1]	271,654	71,217	20,313
Income from discontinued operations attributable to noncontrolling common units of the Operating Partnership																	(6,570)	(2,019)	(646)
Numerator for basic and diluted net income (loss) available to common stockholders																	$ 248,224	$ 49,510	$ 3,361
Denominator:
Basic weighted average vested units outstanding																	69,639,623	56,717,121	49,497,487
Effect of dilutive securities - contingently issuable shares and stock options																	0	0	0
Weighted average common shares outstanding-diluted																	69,639,623	56,717,121	49,497,487
Basic earnings per share:
Loss from continuing operations available to common stockholders per common share-basic (Note 19)																	$ (0.24)	$ (0.35)	$ (0.33)
Income from discontinued operations per common share																	$ 3.80	$ 1.22	$ 0.40
Net income available to common stockholders per share-basic	$ 2.49	[2]	$ (0.04)	[2]	$ (0.02)	[2]	$ 1.06	[2]	$ 0.68	[2]	$ 0.17	[2]	$ (0.01)	[2]	$ 0.01	[2]	$ 3.56	$ 0.87	$ 0.07
Diluted earnings per share:
Loss from continuing operations available to common stockholders per common share-diluted (Note 19)																	$ (0.24)	$ (0.35)	$ (0.33)
Income from discontinued operations per common share																	$ 3.80	$ 1.22	$ 0.40
Net income available to common stockholders per share-diluted	$ 2.45	[2]	$ (0.04)	[2]	$ (0.02)	[2]	$ 1.06	[2]	$ 0.68	[2]	$ 0.17	[2]	$ (0.01)	[2]	$ 0.01	[2]	$ 3.56	$ 0.87	$ 0.07
Number of options, outstanding	1,540,000								5,000								1,540,000	5,000
Market Measure-Based Restricted Stock Units (RSUs) [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Number of RSUs outstanding	88,490																88,490

[1] All periods have been adjusted from amounts previously disclosed in our quarterly filings on Form 10-Q to reclassify amounts related to discontinued operations (see Note 17).

[2] The summation of the quarterly financial data may not equal the annual number reported on the consolidated statements of operations due to rounding. The summation of the quarterly net income (loss) available to common stockholders per share does not equal the annual number reported on the consolidated statements of operations due to the impact of equity offerings that occurred during the years ended December 31, 2012 and 2011.