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Earnings/(Loss) Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended	12 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Operating Partnership Units [Member]	Jun. 30, 2011 Operating Partnership Units [Member]	Jun. 30, 2012 Operating Partnership Units [Member]	Jun. 30, 2011 Operating Partnership Units [Member]	Jun. 30, 2012 Convertible Preferred Stock [Member]	Dec. 31, 2011 Convertible Preferred Stock [Member]	Jun. 30, 2012 Stock Compensation Plan [Member]	Jun. 30, 2011 Stock Compensation Plan [Member]	Jun. 30, 2012 Stock Compensation Plan [Member]	Jun. 30, 2011 Stock Compensation Plan [Member]
Numerator for earnings per share - basic and diluted:
Net loss attributable to common stockholders	$ 145,721	$ 12,149	$ 226,569	$ (18,094)
Denominator for earnings per share - basic and diluted:
Weighted average common shares outstanding	234,657,000	191,758,000	228,697,000	187,832,000
Non-vested restricted stock awards	(626,000)	(1,279,000)	(931,000)	(1,305,000)
Denominator for basic and diluted earnings per share	234,031,000	190,479,000	227,766,000	186,527,000
Net loss attributable to common stockholders	$ 0.62	$ 0.06	$ 0.99	$ (0.10)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share amount					9,416,843	7,630,342	9,419,070	6,353,248	3,035,548	3,035,548	1,348,466	2,043,257	1,328,336	1,997,222

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