Reportable Segments- Income from Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Community base rental income	$ 126,739	$ 120,692
Resort base rental income	64,254	61,068
Right-to-use annual payments	11,519	11,252
Right-to-use contracts current period, gross	3,162	3,206
Right-to-use contract upfront payments, deferred, net	(1,285)	(775)
Utility and other income	25,521	22,126
Gross revenue from home sales	8,309	7,027
Brokered resale revenues and ancillary services revenues, net	1,401	1,661
Total revenues	246,025	232,389
Expenses:
Property operating and maintenance	74,908	68,054
Real estate taxes	14,135	14,037
Sales and marketing, gross	2,812	2,690
Right-to-use contract commissions, deferred, net	(24)	(84)
Property management	13,681	12,560
Cost of home sales	8,574	7,119
Home selling expenses	1,075	925
Rental home operating and maintenance	1,424	1,551
Total expenses	183,043	170,464
Income before equity in income of unconsolidated joint ventures	62,982	61,925
Property Operations
Revenues:
Community base rental income	126,739	120,692
Resort base rental income	64,254	61,068
Right-to-use annual payments	11,519	11,252
Right-to-use contracts current period, gross	3,162	3,206
Right-to-use contract upfront payments, deferred, net	(1,285)	(775)
Utility and other income	25,521	22,126
Ancillary services revenues, net	1,106	1,419
Total revenues	231,016	218,988
Expenses:
Property operating and maintenance	74,908	68,054
Real estate taxes	14,135	14,037
Sales and marketing, gross	2,812	2,690
Right-to-use contract commissions, deferred, net	(24)	(84)
Property management	13,681	12,560
Total expenses	105,512	97,257
Income before equity in income of unconsolidated joint ventures	125,504	121,731
Home Sales and Rentals Operations
Revenues:
Resort base rental income	3,515	3,605
Ancillary services revenues, net	13	0
Gross revenue from home sales	8,309	7,027
Brokered resale revenues and ancillary services revenues, net	282	242
Total revenues	12,119	10,874
Expenses:
Cost of home sales	8,574	7,119
Home selling expenses	1,075	925
Rental home operating and maintenance	1,424	1,551
Total expenses	11,073	9,595
Income before equity in income of unconsolidated joint ventures	$ 1,046	$ 1,279