Reportable Segments - Income from Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues:
Other income	$ 11,059	$ 10,370
Total revenues	280,476	259,090
Expenses:
Real estate taxes	16,841	15,323
Sales and marketing, gross	3,978	3,409
Membership sales commissions, deferred, net	(216)	(191)
Total expenses	209,959	192,595
Income before equity in income of unconsolidated joint ventures	70,517	119,002
Property Operations
Revenues:
Rental income	235,364	219,982
Other income	11,059	10,370
Total revenues	262,474	246,016
Expenses:
Property operating and maintenance	82,291	76,744
Real estate taxes	16,841	15,323
Sales and marketing, gross	3,978	3,409
Membership sales commissions, deferred, net	(216)	(191)
Total expenses	117,898	108,970
Income before equity in income of unconsolidated joint ventures	144,576	137,046
Home Sales and Rentals Operations
Revenues:
Rental home income	3,982	3,584
Total revenues	15,552	10,337
Expenses:
Property operating and maintenance	1,343	1,204
Home selling expenses	1,213	1,083
Total expenses	14,467	8,919
Income before equity in income of unconsolidated joint ventures	1,085	1,418
Annual membership subscriptions
Revenues:
Contract revenue	13,073	12,316
Annual membership subscriptions | Property Operations
Revenues:
Contract revenue	13,073	12,316
Membership upgrade sales current period, gross
Revenues:
Contract revenue	4,843	3,838
Membership upgrade sales current period, gross | Property Operations
Revenues:
Contract revenue	4,843	3,838
Membership upgrade sales upfront payments, deferred, net
Revenues:
Contract revenue	(2,542)	(1,771)
Membership upgrade sales upfront payments, deferred, net | Property Operations
Revenues:
Contract revenue	(2,542)	(1,771)
Gross revenues from home sales
Revenues:
Contract revenue	11,309	6,475
Expenses:
Cost of home sales	11,911	6,632
Gross revenues from home sales | Home Sales and Rentals Operations
Revenues:
Contract revenue	11,309	6,475
Expenses:
Cost of home sales	11,911	6,632
Brokered resale revenues, net | Home Sales and Rentals Operations
Revenues:
Contract revenue	261	278
Ancillary services | Property Operations
Revenues:
Contract revenue	677	1,281
Ancillary services | Home Sales and Rentals Operations
Revenues:
Contract revenue	0	0
Property management
Expenses:
Cost of home sales	15,004	13,685
Property management | Property Operations
Expenses:
Cost of home sales	$ 15,004	$ 13,685