Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
(Loss) income from continuing operations		$ (13,465)	$ (58,511)	$ (165,339)	$ 100,763	$ 91,269	$ (6,340)	$ (25,394)	$ (168,174)	$ 160,298	$ (72,941)
Income (Loss) Attributable to Noncontrolling Interest									6,834	(6,417)	3,880
Net loss (income) attributable to Noncontrolling Interests - Partially Owned Properties									538	(844)	(832)
Dividends, Preferred Stock									(4,145)	(10,355)	(13,865)
Redemption Premium									0	(5,152)	0
Income From Continuing Operations Available To Common Shares										143,947
Income (Loss) from Continuing Operations Attributable to Parent									(164,947)	137,530	(83,758)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent									1,991,415	688,682	963,478
Net Income Loss Available To Common Stockholder Basic									1,826,468	826,212	879,720
Discontinued operations, net		405,182	395,243	1,226,373	283,636	145,054	114,655	177,561	2,073,527	720,906	1,008,138
Net Income (Loss) Available to Common Stockholders, Diluted									1,826,468	864,853	879,720
Weighted Average Number of Shares Outstanding, Basic	359,919	359,811	359,653	337,532	310,398	301,336	300,193	298,805	354,305	302,701	294,856
Dilutive Op Units										13,853
Dilutive Securities Options										3,212
Weighted average Common Shares outstanding	375,860	359,811	359,653	337,532	327,108	318,773	300,193	298,805	354,305	319,766	294,856
Earnings Per Share, Basic	$ 0.31	$ 1.05	$ 0.90	$ 3.01	$ 1.18	$ 0.73	$ 0.33	$ 0.47	$ 5.155	$ 2.729	$ 2.984
Earnings Per Share, Diluted	$ 0.30	$ 1.05	$ 0.90	$ 3.01	$ 1.17	$ 0.72	$ 0.33	$ 0.47	$ 5.155	$ 2.705	$ 2.984
(Loss) income from continuing operations available to Common Shares									$ (0.466)	$ 0.454	$ (0.284)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share									$ 5.621	$ 2.275	$ 3.268
(Loss) income from Continuing Operations, Per Diluted Share									$ (0.466)	$ 0.450	$ (0.284)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share									$ 5.621	$ 2.255	$ 3.268
Common Stock, Dividends, Per Share, Declared									$ 1.850	$ 1.780	$ 1.580
OPERATING PARTNERSHIP
(Loss) income from continuing operations									(168,174)	160,298	(72,941)
Net loss (income) attributable to Noncontrolling Interests - Partially Owned Properties									538	(844)	(832)
Redemption Premium									0	(5,152)	0
Discontinued operations, net									2,073,527	720,906	1,008,138
Dilutive Securities Options										3,212
Earnings Per Share, Basic									$ 5.155	$ 2.729	$ 2.984
Earnings Per Share, Diluted									$ 5.155	$ 2.705	$ 2.984
(Loss) income from continuing operations available to Common Shares									$ (0.466)	$ 0.454	$ (0.284)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share									$ 5.621	$ 2.275	$ 3.268
(Loss) income from Continuing Operations, Per Diluted Share									$ (0.466)	$ 0.450	$ (0.284)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share									$ 5.621	$ 2.255	$ 3.268
Dividend preference units									(4,145)	(10,355)	(13,865)
Income Loss From Continuing Operations Available To Units									(171,781)	143,947	(87,638)
Net Income loss available to Op unitholders basic diluted numerator									$ 1,901,746	$ 864,853	$ 920,500
Weighted Average Limited Partnership and General Partnership Units Outstanding, Basic									368,038	316,554	308,062
Weighted Average Number Of Limited Partnership And General Partnership Unit Outstanding Diluted									368,038	319,766	308,062
Distributions Per Limited Partnership and General Partnership Unit, Outstanding, Basic									$ 1.85	$ 1.78	$ 1.58