Earnings (Loss) Per Common Share/Unit (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Earnings per share reconciliation details
Net earnings (loss) available for common stockholders	$ (8,120)	$ (151,471)	$ 194,293	$ (198,087)
Weighted average common shares/units outstanding - Basic	459,878	307,756	459,549	281,384
Earnings (Loss) Per Common Share/Unit (Textual) [Abstract]
Total weighted average potentially dilutive share options and awards outstanding	9,835	4,966	9,977	3,715
REIT [Member]
Earnings per share reconciliation details
Net earnings (loss) available for common stockholders	(8,120)	(151,471)	194,293	(198,087)
Noncontrolling interest attributable to exchangeable limited partnership units			1,069
Adjusted net earnings (loss) available for common stockholders	(8,120)	(151,471)	195,362	(198,087)
Weighted average common shares/units outstanding - Basic	459,878	307,756	459,549	281,384
Incremental weighted average effect of exchange of limited partnership units			3,299
Incremental weighted average effect of share awards			1,848
Weighted average common shares outstanding - Basic and Diluted	459,878	307,756	464,696	281,384
Net earnings (loss) per share available for common stockholders - Basic and Diluted	$ (0.02)	$ (0.49)	$ 0.42	$ (0.70)
Operating Partnership [Member]
Earnings per share reconciliation details
Net earnings (loss) available for common stockholders	(8,173)	(151,471)	195,181	(198,087)
Noncontrolling interest attributable to exchangeable limited partnership units			121
Adjusted net earnings (loss) available for common stockholders	$ (8,173)	$ (151,471)	$ 195,302	$ (198,087)
Weighted average common shares/units outstanding - Basic	461,842	308,389	461,559	281,702
Incremental weighted average effect of exchange of limited partnership units			1,289
Incremental weighted average effect of share awards			1,848
Weighted average common shares outstanding - Basic and Diluted	461,842	308,389	464,696	281,702
Net earnings (loss) per share available for common stockholders - Basic and Diluted	$ (0.02)	$ (0.49)	$ 0.42	$ (0.70)

Adjusted net earnings loss attributable to common shares.

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Incremental common shares attributable to conversion of limited partnership units.

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Total weighted average potentially dilutive share options and awards outstanding.

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Nonvested equity-based payment awards that contain forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) that result in incremental common shares.

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Amount of net Income or Loss for the period allocated to noncontrolling partners of a limited partnership included in the entity's consolidated financial statements.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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