Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	$ (12,467)	$ 92,181	$ (234,414)	$ 62,103
Income (Loss) Attributable to Noncontrolling Interest	483	(3,895)	9,402	(2,128)
Allocation Of Net Income Loss To Noncontrolling Interests Partially Owned Properties	311	312	1,101	(457)
Dividends, Preferred Stock	(1,037)	(2,386)	(3,109)	(9,319)
Redemption Premium	0	(5,150)	0	(5,150)
Income From Continuing Operations Available To Common Shares		84,957		47,177
Income (Loss) from Continuing Operations Attributable to Parent	(12,710)	81,062	(227,020)	45,049
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	388,865	137,541	1,943,548	415,184
Net Income Loss Available To Common Stockholder Basic	376,155	218,603	1,716,528	460,233
Weighted Average Number of Shares Outstanding, Basic	359,811	301,336	352,414	300,116
Dilutive Op Units		14,177		13,816
Dilutive Securities Options		3,260		3,333
Weighted Average Number Of Limited Partnership And General Partnership Unit Outstanding Diluted	359,811		352,414
Earnings Per Share, Basic	$ 1.045	$ 0.725	$ 4.871	$ 1.534
Earnings Per Share, Diluted	$ 1.045	$ 0.719	$ 4.871	$ 1.519
(Loss) income from continuing operations available to Common Shares	$ (0.035)	$ 0.269	$ (0.644)	$ 0.150
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share	$ 1.080	$ 0.456	$ 5.515	$ 1.384
Income (Loss) from Continuing Operations, Per Diluted Share	$ (0.035)	$ 0.267	$ (0.644)	$ 0.149
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share	$ 1.080	$ 0.452	$ 5.515	$ 1.370
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	404,184	144,142	2,023,897	434,702
Net Income (Loss) Available to Common Stockholders, Diluted	376,155	229,099	1,716,528	481,879
OPERATING PARTNERSHIP
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	(12,467)	92,181	(234,414)	62,103
Allocation Of Net Income Loss To Noncontrolling Interests Partially Owned Properties	311	312	1,101	(457)
Redemption Premium	0	(5,150)	0	(5,150)
Dilutive Securities Options		3,260		3,333
Weighted Average Number Of Limited Partnership And General Partnership Unit Outstanding Diluted	373,547	318,773	366,150	317,265
Earnings Per Share, Basic	$ 1.045	$ 0.725	$ 4.871	$ 1.534
Earnings Per Share, Diluted	$ 1.045	$ 0.719	$ 4.871	$ 1.519
(Loss) income from continuing operations available to Common Shares	$ (0.035)	$ 0.269	$ (0.644)	$ 0.150
Income (Loss) from Continuing Operations, Per Diluted Share	$ (0.035)	$ 0.267	$ (0.644)	$ 0.149
Dividend preference units	(1,037)	(2,386)	(3,109)	(9,319)
Income Loss From Continuing Operations Available To Units	(13,193)	84,957	(236,422)	47,177
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	404,184	144,142	2,023,897	434,702
Net Income loss available to Op unitholders basic diluted numerator	$ 390,991	$ 229,099	$ 1,787,475	$ 481,879
Weighted Average Limited Partnership and General Partnership Units Outstanding, Basic	373,547	315,513	366,150	313,932
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership and General Partnership Unit, Basic	$ 1.080	$ 0.456	$ 5.515	$ 1.384
Income Loss From Discontinued Operations Net Of Tax Per Outstanding Limited Partnership And General Partnership Diluted	$ 1.080	$ 0.452	$ 5.515	$ 1.370