Supplemental Disclosure of Cash Flow Information - Supplemental Disclosure of Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Supplemental Disclosure of Cash Flow Information:
Interest paid	$ 231,786	$ 200,308	$ 188,791
Income taxes paid, net of (refunds)	(1,429)	(330)	5,923
Capital expenditures, net of related payables	233,205	196,924	176,657
Prepaid expenses and other assets, net	21,629	(21,240)	(15,483)
Investment in unconsolidated ventures	(7,589)	(218)	(5,436)
Other non-operating loss (income)	(21,687)	(12,114)	(5,903)
Accounts receivable, net	7,380	(4,624)	502
Refundable fees and deferred revenue	(654)	(1,934)	(10,066)
Loss (gain) on sale of communities, net	(36,296)	(73,850)	0
Capital expenditures, net of related payables:
Supplemental Disclosure of Cash Flow Information:
Capital expenditures, net of related payables	233,205	196,924	176,657
Trade accounts payable	4,613	(3,085)	(6,061)
Acquisition of assets, net of cash acquired:
Supplemental Disclosure of Cash Flow Information:
Prepaid expenses and other assets, net	23	0	0
Property, plant and equipment and leasehold intangibles, net	6,872	4	0
Investment in unconsolidated ventures	(3,395)	0	0
Financing lease obligations	0	6,000	0
Other liabilities	(384)	0	0
Other non-operating loss (income)	(2,542)	0	0
Net cash paid	574	6,004	0
Proceeds from HCS Sale, net:
Supplemental Disclosure of Cash Flow Information:
Trade accounts payable	0	0	1,387
Prepaid expenses and other assets, net	0	0	(32,963)
Property, plant and equipment and leasehold intangibles, net	0	0	(1,806)
Other liabilities	0	0	9,165
Operating lease right-of-use assets	0	0	(8,145)
Accounts receivable, net	0	0	(57,582)
Investment in unconsolidated ventures	0	0	100,000
Goodwill	0	0	(126,810)
Accrued expenses	0	0	25,226
Refundable fees and deferred revenue	0	0	57,314
Operating lease obligations	0	0	8,145
Non-operating loss (gain) on sale of assets, net	0	0	(286,489)
Net cash received	0	0	(312,558)
Proceeds from sale of other assets, net:
Supplemental Disclosure of Cash Flow Information:
Prepaid expenses and other assets, net	(1,889)	(1,308)	(1,983)
Property, plant and equipment and leasehold intangibles, net	(36,545)	(107)	(878)
Investment in unconsolidated ventures	(27,392)	0	0
Other liabilities	10,690	1,025	(75)
Refundable fees and deferred revenue	9,347	0	0
Non-operating loss (gain) on sale of assets, net	(1,441)	(595)	(2,346)
Loss (gain) on sale of communities, net	(36,296)	0	0
Assets held for sale	0	(3,668)	(16,166)
Net cash received	(83,526)	(4,653)	(21,448)
Non-Development | Capital expenditures, net of related payables:
Supplemental Disclosure of Cash Flow Information:
Capital expenditures, net of related payables	216,511	168,166	137,410
Development | Capital expenditures, net of related payables:
Supplemental Disclosure of Cash Flow Information:
Capital expenditures, net of related payables	1,762	6,193	3,208
Non-development - Reimbursable | Capital expenditures, net of related payables:
Supplemental Disclosure of Cash Flow Information:
Capital expenditures, net of related payables	$ 10,319	$ 25,650	$ 42,100