Earnings (Loss) Per Common Share/Unit (Details) (USD $) In Thousands, except Per Share data	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Earnings per share reconciliation details
Net earnings (loss) attributable to common stock/unitholders	$ 55,436	$ (15,052)	$ (142,651)	$ (129,331)
Weighted average common shares/units outstanding - Basic	458,256	212,945	340,923	212,611
Weighted average common shares outstanding - Diluted	462,408	212,945	340,923	212,611
Earnings (Loss) Per Common Share/Unit (Textuals) [Abstract]
Total weighted average potentially dilutive share options and awards outstanding	9,909
REIT [Member]
Earnings per share reconciliation details
Net earnings (loss) attributable to common stock/unitholders	55,436	(15,052)	(142,651)	(129,331)
Noncontrolling interest attributable to exchangeable limited partnership units	(485)
Adjusted net earnings loss attributable to common stock/unitholders	54,951	(15,052)	(142,651)	(129,331)
Weighted average common shares/units outstanding - Basic	458,256	212,945	340,923	212,611
Incremental weighted average effect of conversion/exchange of limited partnership units	3,362
Incremental weighted average effect of share awards	790
Weighted average common shares outstanding - Diluted	462,408	212,945	340,923	212,611
Net earnings (loss) per share attributable to common shares/unitholders - Basic and Diluted	$ 0.12	$ (0.07)	$ (0.42)	$ (0.61)
Operating Partnership [Member]
Earnings per share reconciliation details
Net earnings (loss) attributable to common stock/unitholders	54,906	15,052	(143,181)	(129,331)
Noncontrolling interest attributable to exchangeable limited partnership units	45
Adjusted net earnings loss attributable to common stock/unitholders	$ 54,951	$ 15,052	$ (143,181)	$ (129,331)
Weighted average common shares/units outstanding - Basic	460,315	212,945	341,828	212,611
Incremental weighted average effect of conversion/exchange of limited partnership units	1,303
Incremental weighted average effect of share awards	790
Weighted average common shares outstanding - Diluted	462,408	212,945	341,828	212,611
Net earnings (loss) per share attributable to common shares/unitholders - Basic and Diluted	$ 0.12	$ (0.07)	$ (0.42)	$ (0.61)

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