Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	$ 81,698	$ (165,339)
Income (Loss) Attributable to Noncontrolling Interest	(3,053)	6,836
Allocation Of Net Income Loss To Noncontrolling Interests Partially Owned Properties	(504)	(25)
Dividends, Preferred Stock	(1,036)	(1,036)
Income (Loss) from Continuing Operations Attributable to Parent	77,105	(159,564)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	994	1,176,214
Net Income Loss Available To Common Stockholder Basic	78,099	1,016,650
Income From Continuing Operations Available To Common Shares	80,158
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	1,034	1,226,373
Net Income (Loss) Available to Common Stockholders, Diluted	81,192	1,016,650
Weighted Average Number of Shares Outstanding, Basic	360,470	337,532
Dilutive Op Units	13,731
Dilutive Securities Options	2,183
Weighted Average Number of Shares Outstanding, Diluted	376,384	337,532
Earnings Per Share, Basic	$ 0.217	$ 3.012
Earnings Per Share, Diluted	$ 0.216	$ 3.012
Income (loss) from continuing operations available to Common Shares	$ 0.214	$ (0.473)
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share	$ 0.003	$ 3.485
Income (loss) from continuing operations available to Common Shares	$ 0.213	$ (0.473)
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share	$ 0.003	$ 3.485
OPERATING PARTNERSHIP
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	81,698	(165,339)
Allocation Of Net Income Loss To Noncontrolling Interests Partially Owned Properties	(504)	(25)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	1,034	1,226,373
Dilutive Securities Options	2,183
Earnings Per Share, Basic	$ 0.217	$ 3.012
Earnings Per Share, Diluted	$ 0.216	$ 3.012
Income (loss) from continuing operations available to Common Shares	$ 0.214	$ (0.473)
Income (loss) from continuing operations available to Common Shares	$ 0.213	$ (0.473)
Dividend preference units	(1,036)	(1,036)
Income Loss From Continuing Operations Available To Units	80,158	(166,400)
Net Income loss available to Op unitholders basic diluted numerator	$ 81,192	$ 1,059,973
Weighted Average Limited Partnership and General Partnership Units Outstanding, Basic	374,201	351,255
Weighted Average Number Of Limited Partnership And General Partnership Unit Outstanding Diluted	376,384	351,255
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership and General Partnership Unit, Basic	$ 0.003	$ 3.485
Income Loss From Discontinued Operations Net Of Tax Per Outstanding Limited Partnership And General Partnership Diluted	$ 0.003	$ 3.485