Segment Reporting Identifiable Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Segment Reporting, Asset Reconciling Item [Line Items]
Investment property, net	$ 10,394,052	$ 9,715,791
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	119,612	92,641	$ 389,214	$ 34,830
Marketable securities	153,049	124,726
Inventory of manufactured homes	43,686	46,643
Notes and other receivables, net	262,333	221,650
Goodwill	448,317	428,833
Collateralized receivables, net	295,663	305,611
Other assets	324,278	270,691
Total Assets	12,040,990	11,206,586
Real Property Operations Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Investment property, net	4,815,014	4,823,174
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	61,163	53,152
Marketable securities	99,119	80,776
Inventory of manufactured homes	33,064	33,448
Notes and other receivables, net	167,642	144,027
Goodwill	0	0
Collateralized receivables, net	29,394	33,998
Other assets	181,702	184,917
Total Assets	5,387,098	5,353,492
Home Sales and Home Rentals Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Investment property, net	3,251,466	3,038,686
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	33,278	28,919
Marketable securities	53,930	43,950
Inventory of manufactured homes	10,622	13,195
Notes and other receivables, net	55,027	44,002
Goodwill	0	0
Collateralized receivables, net	23,601	23,819
Other assets	45,797	38,075
Total Assets	3,473,721	3,230,646
Marina Sale Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Investment property, net	2,327,572	1,853,931
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	25,171	10,570
Marketable securities	0	0
Inventory of manufactured homes	0	0
Notes and other receivables, net	39,664	33,621
Goodwill	448,317	428,833
Collateralized receivables, net	242,668	247,794
Other assets	96,779	47,699
Total Assets	$ 3,180,171	$ 2,622,448