Investments in Partially Owned Entities (Details 1) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Partially Owned Property Income Statement Schedule
Operating revenue	$ 511,958	$ 453,960	$ 1,477,080	$ 1,318,973
Net operating (loss) income		272,354
Depreciation	164,552	158,318	482,039	457,822
General and administrative/other	(10,121)	(10,221)	(32,462)	(31,029)
Operating (loss) income	151,076	105,264	414,159	301,887
Interest and other income	5,317	201	6,608	5,045
Other expenses	(2,528)	(3,487)	(9,318)	(9,513)
Interest:
Expense incurred, net	(113,370)	(121,116)	(354,960)	(348,279)
Amortization of deferred financing costs	(4,721)	(2,437)	(12,129)	(7,729)
(Loss) income before income and other taxes and net gains on sales of land parcels and discontinued operations	35,774	(21,575)	44,360	(58,589)
Income and other tax (expense) benefit	(283)	(291)	(669)	(283)
Net gain (loss) on sales of land parcels		(1,161)	4,217	(1,161)
Net gain on sales of discontinued operations	(76,864)	(9,285)	759,100	69,538
Net income	112,977	29,826	827,796	97,771
Co-invested in various properties with unrelated third parties [Member] | Consolidated Development Projects Held for and or Under Development [Member]
Partially Owned Property Income Statement Schedule
Operating expenses			207
Net operating (loss) income			(207)
General and administrative/other			115
Operating (loss) income			(322)
Interest and other income			5
Other expenses			(289)
Interest:
Expense incurred, net			(399)
(Loss) income before income and other taxes and net gains on sales of land parcels and discontinued operations			(1,005)
Income and other tax (expense) benefit			(57)
Net gain (loss) on sales of land parcels			4,217
Net gain on sales of discontinued operations			169
Net income			3,324
Co-invested in various properties with unrelated third parties [Member] | Consolidated Development Projects Completed and Stabilized [Member]
Partially Owned Property Income Statement Schedule
Operating revenue			6,649
Operating expenses			3,083
Net operating (loss) income			3,566
Depreciation			(3,121)
General and administrative/other			6
Operating (loss) income			439
Interest and other income			5
Interest:
Expense incurred, net			(2,465)
Amortization of deferred financing costs			(202)
(Loss) income before income and other taxes and net gains on sales of land parcels and discontinued operations			(2,223)
Net income			(2,223)
Co-invested in various properties with unrelated third parties [Member] | Consolidated Other [Member]
Partially Owned Property Income Statement Schedule
Operating revenue			43,016
Operating expenses			14,487
Net operating (loss) income			28,529
Depreciation			(11,256)
General and administrative/other			50
Operating (loss) income			17,223
Interest and other income			10
Other expenses			(39)
Interest:
Expense incurred, net			(8,948)
Amortization of deferred financing costs			(341)
(Loss) income before income and other taxes and net gains on sales of land parcels and discontinued operations			7,905
Income and other tax (expense) benefit			(6)
Net gain on sales of discontinued operations			13,265
Net income			21,164
Co-invested in various properties with unrelated third parties [Member]
Partially Owned Property Income Statement Schedule
Operating revenue			49,665
Operating expenses			17,777
Net operating (loss) income			31,888
Depreciation			(14,377)
General and administrative/other			171
Operating (loss) income			17,340
Interest and other income			20
Other expenses			(328)
Interest:
Expense incurred, net			(11,812)
Amortization of deferred financing costs			(543)
(Loss) income before income and other taxes and net gains on sales of land parcels and discontinued operations			4,677
Income and other tax (expense) benefit			(63)
Net gain (loss) on sales of land parcels			4,217
Net gain on sales of discontinued operations			13,434
Net income			$ 22,265