Investments in Partially Owned Entities - Partially Owned Property Income Statement Schedule (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Partially Owned Property Income Statement Schedule
Operating revenue	$ 633,016	$ 604,100
Property management	23,444	22,252
General and administrative	16,278	14,173
Depreciation	196,309	178,968
Operating income	196,869	204,371
Interest and other income	5,880	601
Interest:
Expense incurred, net	(116,104)	(106,210)
Amortization of deferred financing costs	(3,679)	(2,296)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of real estate properties and land parcels	79,525	95,376
Income and other tax (expense) benefit	(213)	(262)
Income (loss) from investments in unconsolidated entities	(977)	(1,073)
Net income	220,548	$ 149,941
Unconsolidated Non-VIE
Partially Owned Property Income Statement Schedule
Operating revenue	6,942
Operating expenses	2,268
Net operating income	4,674
Property management	199
General and administrative	0
Depreciation	2,677
Operating income	1,798
Interest and other income	0
Interest:
Expense incurred, net	(2,072)
Amortization of deferred financing costs	0
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of real estate properties and land parcels	(274)
Income and other tax (expense) benefit	(13)
Income (loss) from investments in unconsolidated entities	0
Net income	(287)
Consolidated VIE
Partially Owned Property Income Statement Schedule
Operating revenue	26,447
Operating expenses	6,637
Net operating income	19,810
Property management	955
General and administrative	17
Depreciation	10,479
Operating income	8,359
Interest and other income	27
Interest:
Expense incurred, net	(3,312)
Amortization of deferred financing costs	(68)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of real estate properties and land parcels	5,006
Income and other tax (expense) benefit	(18)
Income (loss) from investments in unconsolidated entities	(393)
Net income	4,595
Unconsolidated VIE
Partially Owned Property Income Statement Schedule
Operating revenue	1,258
Operating expenses	581
Net operating income	677
Property management	19
General and administrative	0
Depreciation	1,375
Operating income	(717)
Interest and other income	0
Interest:
Expense incurred, net	0
Amortization of deferred financing costs	0
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of real estate properties and land parcels	(717)
Income and other tax (expense) benefit	0
Income (loss) from investments in unconsolidated entities	0
Net income	(717)
Partially Owned Properties – Unconsolidated
Partially Owned Property Income Statement Schedule
Operating revenue	8,200
Operating expenses	2,849
Net operating income	5,351
Property management	218
General and administrative	0
Depreciation	4,052
Operating income	1,081
Interest and other income	0
Interest:
Expense incurred, net	(2,072)
Amortization of deferred financing costs	0
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of real estate properties and land parcels	(991)
Income and other tax (expense) benefit	(13)
Income (loss) from investments in unconsolidated entities	0
Net income	$ (1,004)