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Earnings Per Share (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
Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to common shareholders |  |  |  |  |  |  |  |  | $ 152,808 | $ (44,703) | $ (37,008)
Income (loss) from discontinued operations attributable to common shareholders |  |  |  |  |  |  |  |  | 4,041 | (59,018) | (21,088)
Net income (loss) attributable to common shareholders |  |  |  |  |  |  |  |  | 156,849 | (103,721) | (58,096)
Weighted-average common shares outstanding – basic |  |  |  |  |  |  |  |  | 159,109,424 | 152,473,336 | 130,985,809
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | $ 0.96 | $ (0.29) | $ (0.28)
Income (loss) from discontinued operations |  |  |  |  |  |  |  |  | $ 0.03 | $ (0.39) | $ (0.16)
Net income (loss) attributable to common shareholders | $ (0.04) | $ 1.09 | $ (0.02) | $ (0.01) |  |  |  |  | $ 0.99 | $ (0.68) | $ (0.44)
Impact of assumed conversions: |  |  |  |  |  |  |  |  |  |  |
Share Options |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Partnership Units |  |  |  |  |  |  |  |  | 1,371 | 0 | 0
6.00% Convertible Guaranteed Notes |  |  |  |  |  |  |  |  | 8,953 | 0 | 0
Income (loss) from continuing operations attributable to common shareholders |  |  |  |  |  |  |  |  | 163,132 | (44,703) | (37,008)
Income (loss) from discontinued operations attributable to common shareholders |  |  |  |  |  |  |  |  | 4,041 | (59,018) | (21,088)
Operating Partnership Units |  |  |  |  |  |  |  |  | (179) | 0 | 0
Income (loss) from discontinued operations attributable to common shareholders |  |  |  |  |  |  |  |  | 3,862 | (59,018) | (21,088)
Net income (loss) attributable to common shareholders |  |  |  |  |  |  |  |  | 166,994 | (103,721) | (58,096)
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Share Options |  |  |  |  |  |  |  |  | 306,449 | 0 | 0
Operating Partnership Units |  |  |  |  |  |  |  |  | 4,438,708 | 0 | 0
6.00% Convertible Guaranteed Notes |  |  |  |  |  |  |  |  | 15,805,245 | 0 | 0
Weighted-average common shares outstanding |  |  |  |  |  |  |  |  | 179,659,826 | 152,473,336 | 130,985,809
Income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations (USD per share) |  |  |  |  |  |  |  |  | $ 0.91 | $ (0.29) | $ (0.28)
Income (loss) from discontinued operations (USD per share) |  |  |  |  |  |  |  |  | $ 0.02 | $ (0.39) | $ (0.16)
Net income (loss) attributable to common shareholders (USD per share) | $ (0.04) | $ 0.96 | $ (0.02) | $ (0.01) | $ 0.05 | $ (0.24) | $ (0.33) | $ (0.16) | $ 0.93 | $ (0.68) | $ (0.44)
Earnings Per Share |  |  |  |  |  |  |  |  |  |  |
Common shares issued | 178,616,664 |  |  |  | 154,938,351 |  |  |  | 178,616,664 | 154,938,351 |
Series C | Cumulative Convertible |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share |  |  |  |  |  |  |  |  |  |  |
Preferred shares repurchased and retired |  |  |  |  |  |  |  |  | 34,800,000 | 125,000,000 |
Discount to historical cost basis | 229 |  |  |  | 833 |  |  |  | 229 | 833 |
Series B | Cumulative Redeemable |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share |  |  |  |  |  |  |  |  |  |  |
Preferred shares repurchased and retired |  |  |  |  |  |  |  |  | 2,740,874,000 | 419,126,000 |
Premium to historical cost | $ 2,346 |  |  |  | $ 95 |  |  |  | $ 2,346 | $ 95 |

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