Variable Interest Entities - Consolidated Assets and Liabilities of VIEs (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
ASSETS
Buildings and improvements	$ 10,967,446	$ 11,120,039
Development costs and construction in progress	684,979	692,336
Land	1,889,643	1,992,602
Accumulated depreciation and amortization	(2,507,881)	(2,771,922)
Net real estate	11,034,187	11,033,055
Accounts receivable, net	63,216	59,417
Cash and cash equivalents	197,119	144,232	$ 124,990
Restricted cash	102,419	40,425	$ 30,114
Intangible assets, net	501,583	331,693
Right-of-use asset, net	190,875	172,486
Other assets, net	737,098	646,491
Total assets	15,751,821	14,032,891
Liabilities
Mortgage debt	435,206	276,907
Intangible liabilities, net	108,031	74,991
Lease liability	175,002	156,611
Accounts payable, accrued liabilities, and other liabilities	834,518	540,924
Deferred revenue	755,021	289,680
Total liabilities	8,345,513	7,365,417
VIEs
ASSETS
Buildings and improvements	2,977,513	3,236,105
Development costs and construction in progress	114,929	67,285
Land	445,578	526,576
Accumulated depreciation and amortization	(634,028)	(568,574)
Net real estate	2,903,992	3,261,392
Accounts receivable, net	8,397	11,986
Cash and cash equivalents	51,532	47,027
Restricted cash	14,894	13,596
Intangible assets, net	134,147	206,840
Right-of-use asset, net	91,444	92,664
Other assets, net	55,342	52,124
Total assets	3,259,748	3,685,629
Liabilities
Mortgage debt	216,594	218,767
Intangible liabilities, net	17,361	39,545
Lease liability	91,582	90,875
Accounts payable, accrued liabilities, and other liabilities	115,514	122,832
Deferred revenue	89,587	96,985
Total liabilities	$ 530,638	$ 569,004