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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
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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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