Variable Interest Entities - Balance Sheet Disclosures (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Buildings and improvements	$ 11,048,433	$ 8,112,193
Development costs and construction in progress	613,182	654,792
Land	1,867,278	1,605,599
Accumulated depreciation and amortization	(2,409,135)	(2,141,960)
Net real estate	11,119,758	8,230,624
Accounts receivable, net	42,269	44,842
Cash and cash equivalents	44,226	80,398
Intangible assets, net	519,917	260,204
Assets held for sale and discontinued operations, net	2,626,306	3,648,265
Right-of-use asset, net	192,349	167,316
Other assets, net	665,106	538,293
Total assets	15,920,089	14,032,891
Mortgage debt	221,621	12,317
Intangible liabilities, net	144,199	74,991
Liabilities related to assets held for sale and discontinued operations, net	415,737	403,688
Lease liability	179,895	152,400
Accounts payable, accrued liabilities, and other liabilities	763,391	457,532
Deferred revenue	774,316	274,554
Total liabilities	8,575,517	7,365,417
Variable Interest Entity
Variable Interest Entity [Line Items]
Buildings and improvements	2,988,599	2,498,524
Development costs and construction in progress	85,595	67,244
Land	433,574	410,903
Accumulated depreciation and amortization	(602,491)	(534,339)
Net real estate	2,905,277	2,442,332
Accounts receivable, net	12,009	9,508
Cash and cash equivalents	16,550	35,726
Restricted cash	7,977	9,895
Intangible assets, net	179,027	167,022
Assets held for sale and discontinued operations, net	704,966	880,362
Right-of-use asset, net	95,407	92,664
Other assets, net	59,063	48,119
Total assets	3,980,276	3,685,628
Mortgage debt	39,085	44,199
Intangible liabilities, net	56,467	39,545
Liabilities related to assets held for sale and discontinued operations, net	190,919	187,544
Lease liability	97,605	90,875
Accounts payable, accrued liabilities, and other liabilities	102,391	112,301
Deferred revenue	90,183	94,538
Total liabilities	576,650	569,002
Discontinued Operations | Variable Interest Entity
Variable Interest Entity [Line Items]
Buildings and improvements	639,759	737,581
Development costs and construction in progress	68	41
Land	106,209	115,673
Accumulated depreciation and amortization	(57,235)	(34,235)
Net real estate	688,801	819,060
Accounts receivable, net	1,700	2,478
Cash and cash equivalents	6,306	11,301
Restricted cash	3,124	3,700
Intangible assets, net	0	39,817
Right-of-use asset, net	1,391	0
Other assets, net	3,644	4,006
Total assets	704,966	880,362
Mortgage debt	176,702	174,567
Liabilities related to assets held for sale and discontinued operations, net	11,003	10,531
Lease liability	1,392	0
Deferred revenue	1,822	2,446
Total liabilities	$ 190,919	$ 187,544