Reportable Segments - Income from Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Other income	$ 12,268	$ 11,263	$ 33,007	$ 31,898
Total revenues	284,986	271,160	819,552	778,616
Expenses:
Real estate taxes	15,981	15,166	49,490	45,596
Sales and marketing, gross	5,054	4,063	13,308	11,686
Membership sales commissions, deferred, net	(630)	(313)	(1,327)	(893)
Total expenses	232,486	206,502	648,746	601,604
Income before equity in income of unconsolidated joint ventures	52,500	64,658	170,806	229,519
Property Operations
Revenues:
Rental home income	234,711	221,306	683,960	649,663
Other income	12,268	11,263	33,007	31,898
Total revenues	264,284	249,632	764,913	729,496
Expenses:
Property operating and maintenance	97,848	89,162	264,159	249,482
Real estate taxes	15,981	15,166	49,490	45,596
Sales and marketing, gross	5,054	4,063	13,308	11,686
Membership sales commissions, deferred, net	(630)	(313)	(1,327)	(893)
Total expenses	132,780	122,683	369,974	348,546
Income before equity in income of unconsolidated joint ventures	131,504	126,949	394,939	380,950
Home Sales and Rentals Operations
Revenues:
Rental home income	4,158	3,810	12,218	11,026
Total revenues	17,473	12,668	46,147	34,841
Expenses:
Property operating and maintenance	1,718	1,603	4,306	4,099
Home selling expenses	1,241	1,033	3,535	3,218
Total expenses	15,825	11,070	41,468	30,547
Income before equity in income of unconsolidated joint ventures	1,648	1,598	4,679	4,294
Annual membership subscriptions
Revenues:
Contract revenue	13,442	13,150	39,476	38,052
Annual membership subscriptions | Property Operations
Revenues:
Contract revenue	13,442	13,150	39,476	38,052
Membership upgrade sales current period, gross
Revenues:
Contract revenue	6,631	5,730	16,522	14,609
Membership upgrade sales current period, gross | Property Operations
Revenues:
Contract revenue	6,631	5,730	16,522	14,609
Membership upgrade sales upfront payments, deferred, net
Revenues:
Contract revenue	(4,171)	(3,530)	(9,379)	(8,213)
Membership upgrade sales upfront payments, deferred, net | Property Operations
Revenues:
Contract revenue	(4,171)	(3,530)	(9,379)	(8,213)
Gross revenues from home sales
Revenues:
Contract revenue	13,070	8,438	33,245	22,738
Expenses:
Cost of home sales	12,866	8,434	33,627	23,230
Gross revenues from home sales | Home Sales and Rentals Operations
Revenues:
Contract revenue	13,070	8,438	33,245	22,738
Expenses:
Cost of home sales	12,866	8,434	33,627	23,230
Brokered resale revenues, net | Home Sales and Rentals Operations
Revenues:
Contract revenue	245	420	684	1,077
Ancillary services | Property Operations
Revenues:
Contract revenue	1,403	1,713	1,327	3,487
Ancillary services | Home Sales and Rentals Operations
Revenues:
Contract revenue	0	0	0	0
Property management
Expenses:
Cost of home sales	14,527	14,605	44,344	42,675
Property management | Property Operations
Expenses:
Cost of home sales	$ 14,527	$ 14,605	$ 44,344	$ 42,675