Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	$ (51,455)	$ 474	$ (209,793)	$ (18,177)
Income (Loss) Attributable to Noncontrolling Interest	1,963	154	8,513	1,139
Allocation Of Net Income Loss To Noncontrolling Interests Partially Owned Properties	815	(319)	790	(769)
Dividends, Preferred Stock	(1,036)	(3,467)	(2,072)	(6,933)
Income (Loss) from Continuing Operations Attributable to Parent	(49,713)	(3,158)	(202,562)	(24,740)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	373,436	102,955	1,542,935	266,370
Net Income Loss Available To Common Stockholder Basic	323,723	99,797	1,340,373	241,630
Weighted Average Number of Shares Outstanding, Basic	359,653	300,193	348,654	299,499
Earnings Per Share, Basic	$ 0.900	$ 0.332	$ 3.844	$ 0.807
Earnings Per Share, Diluted	$ 0.900	$ 0.332	$ 3.844	$ 0.807
(Loss) from continuing operations available to Common Shares	$ (0.138)	$ (0.011)	$ (0.581)	$ (0.082)
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share	$ 1.038	$ 0.343	$ 4.425	$ 0.889
Income (Loss) from Continuing Operations, Per Diluted Share	$ (0.138)	$ (0.011)	$ (0.581)	$ (0.082)
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share	$ 1.038	$ 0.343	$ 4.425	$ 0.889
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	388,187	107,841	1,607,559	278,659
OPERATING PARTNERSHIP
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	(51,455)	474	(209,793)	(18,177)
Allocation Of Net Income Loss To Noncontrolling Interests Partially Owned Properties	815	(319)	790	(769)
Earnings Per Share, Basic	$ 0.900	$ 0.332	$ 3.844	$ 0.807
Earnings Per Share, Diluted	$ 0.900	$ 0.332	$ 3.844	$ 0.807
(Loss) from continuing operations available to Common Shares	$ (0.14)	$ (0.01)	$ (0.58)	$ (0.08)
Income (Loss) from Continuing Operations, Per Diluted Share	$ (0.14)	$ (0.01)	$ (0.58)	$ 0.08
Dividend preference units	(1,036)	(3,467)	(2,072)	(6,933)
Income Loss From Continuing Operations Available To Units	(51,676)	(3,312)	(211,075)	(25,879)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	388,187	107,841	1,607,559	278,659
Net Income loss available to Op unitholders basic diluted numerator	$ 336,511	$ 104,529	$ 1,396,484	$ 252,780
Weighted Average Limited Partnership and General Partnership Units Outstanding, Basic	373,403	314,255	362,390	313,133
Income Losses From Continuing Operations Per Outstanding Limited Partnership And General Partnership Unit Basic	$ (0.138)	$ (0.011)	$ (0.581)	$ (0.082)
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership and General Partnership Unit, Basic	$ 1.038	$ 0.343	$ 4.425	$ 0.889
Income Loss From Continuing Operations Per Outstanding Limited Partnership And General Partnership Units Diluted	$ (0.138)	$ (0.011)	$ (0.581)	$ (0.082)
Income Loss From Discontinued Operations Net Of Tax Per Outstanding Limited Partnership And General Partnership Diluted	$ 1.038	$ 0.343	$ 4.425	$ 0.889

Amount of net (income) loss for the period allocated to noncontrolling partners in partially owned properties.

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Capital impact of aggregate cash, stock and paid-in-kind dividends declared for preference units during the period.

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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) and noncontrolling interests.

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Net income after adjustments for dividends on preference units.

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Equity impact of aggregate cash, stock, and paid-in-kind dividends declared for preferred shareholders during the period.

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Amount of Income (Loss) attributable to the noncontrolling interest.

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