Investments in Partially Owned Entities - Partially Owned Property Income Statement Schedule (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Partially Owned Property Income Statement Schedule
Operating revenue	$ 624,122	$ 606,074	$ 1,840,702	$ 1,820,311
Property management	20,861	19,517	64,702	64,003
General and administrative	12,567	12,395	40,366	47,408
Depreciation	184,100	179,230	542,964	528,242
Operating income	217,786	209,373	632,707	632,016
Interest and other income	3,945	5,509	5,708	65,092
Interest:
Expense incurred, net	(91,145)	(86,352)	(288,579)	(386,316)
Amortization of deferred financing costs	(2,064)	(2,261)	(6,447)	(10,000)
Income before income and other taxes, (loss) income from investments in unconsolidated entities, net gain on sales of real estate properties and land parcels and discontinued operations	127,494	115,849	340,229	286,312
Income and other tax (expense) benefit	(228)	(426)	(710)	(1,189)
(Loss) from investments in unconsolidated entities	(398)	7,750	(2,153)	5,846
Net income	$ 144,196	$ 217,492	498,297	$ 4,177,723
Unconsolidated Non-VIE
Partially Owned Property Income Statement Schedule
Operating revenue			20,050
Operating expenses			6,746
Net operating income			13,304
Property management			584
General and administrative			1
Depreciation			7,960
Operating income			4,759
Interest and other income			0
Interest:
Expense incurred, net			(6,217)
Amortization of deferred financing costs			(1)
Income before income and other taxes, (loss) income from investments in unconsolidated entities, net gain on sales of real estate properties and land parcels and discontinued operations			(1,459)
Income and other tax (expense) benefit			(13)
(Loss) from investments in unconsolidated entities			0
Net income			(1,472)
Consolidated VIE
Partially Owned Property Income Statement Schedule
Operating revenue			69,917
Operating expenses			17,056
Net operating income			52,861
Property management			2,463
General and administrative			239
Depreciation			15,569
Operating income			34,590
Interest and other income			45
Interest:
Expense incurred, net			(9,977)
Amortization of deferred financing costs			(203)
Income before income and other taxes, (loss) income from investments in unconsolidated entities, net gain on sales of real estate properties and land parcels and discontinued operations			24,455
Income and other tax (expense) benefit			(34)
(Loss) from investments in unconsolidated entities			(1,155)
Net income			23,266
Unconsolidated VIE
Partially Owned Property Income Statement Schedule
Operating revenue			3,805
Operating expenses			1,573
Net operating income			2,232
Property management			56
General and administrative			127
Depreciation			4,126
Operating income			(2,077)
Interest and other income			0
Interest:
Expense incurred, net			0
Amortization of deferred financing costs			0
Income before income and other taxes, (loss) income from investments in unconsolidated entities, net gain on sales of real estate properties and land parcels and discontinued operations			(2,077)
Income and other tax (expense) benefit			0
(Loss) from investments in unconsolidated entities			0
Net income			(2,077)
Partially Owned Properties – Unconsolidated
Partially Owned Property Income Statement Schedule
Operating revenue			23,855
Operating expenses			8,319
Net operating income			15,536
Property management			640
General and administrative			128
Depreciation			12,086
Operating income			2,682
Interest and other income			0
Interest:
Expense incurred, net			(6,217)
Amortization of deferred financing costs			(1)
Income before income and other taxes, (loss) income from investments in unconsolidated entities, net gain on sales of real estate properties and land parcels and discontinued operations			(3,536)
Income and other tax (expense) benefit			(13)
(Loss) from investments in unconsolidated entities			0
Net income			$ (3,549)