Variable Interest Entities - Balance Sheet Disclosures (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Buildings and improvements	$ 11,120,039	$ 10,877,248
Development costs and construction in progress	692,336	537,643
Land	1,992,602	1,637,506
Accumulated depreciation and amortization	(2,771,922)	(2,842,947)
Net real estate	11,033,055	10,209,450
Investments in and advances to unconsolidated joint ventures	825,515	540,088
Accounts receivable, net	59,417	48,171
Cash and cash equivalents	144,232	110,790
Intangible assets, net	331,693	305,079
Right-of-use asset, net	172,486
Other assets, net	646,491	591,017
Total assets	14,032,891	12,718,553
Mortgage debt	276,907	138,470
Other debt	84,771	90,785
Intangible liabilities, net	74,991	54,663
Lease liability	156,611
Liabilities of assets held for sale, net	36,369	1,125
Deferred revenue	289,680	190,683
Total liabilities	7,365,417	6,205,962
Variable Interest Entity
Variable Interest Entity [Line Items]
Buildings and improvements	3,236,105	1,949,582
Development costs and construction in progress	67,285	39,584
Land	526,576	151,746
Accumulated depreciation and amortization	(568,574)	(398,143)
Net real estate	3,261,392	1,742,769
Investments in and advances to unconsolidated joint ventures	0	1,550
Accounts receivable, net	11,986	7,904
Cash and cash equivalents	47,027	23,772
Restricted cash	13,596	3,399
Intangible assets, net	206,840	111,333
Right-of-use asset, net	92,664	0
Other assets, net	52,124	43,149
Total assets	3,685,629	1,933,876
Mortgage debt	218,767	44,598
Other debt	42,405	0
Intangible liabilities, net	39,545	19,128
Lease liability	90,875	0
Liabilities of assets held for sale, net	80,427	66,736
Deferred revenue	96,985	24,215
Total liabilities	$ 569,004	$ 154,677