Reportable Segments- Income from Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues:
Community base rental income	$ 120,692	$ 114,076
Rental home income	3,605	3,545
Right-to-use annual payments	11,252	11,054
Right-to-use contracts current period, gross	3,206	2,532
Right-to-use contract upfront payments, deferred, net	(775)	(302)
Utility and other income	22,126	20,793
Gross revenue from home sales	7,027	8,214
Brokered resale revenues and ancillary services revenues, net	1,661	1,418
Resort base rental income	61,068	55,434
Total revenues	232,389	220,147
Expenses:
Property operating and maintenance	68,054	62,954
Real estate taxes	14,037	13,198
Sales and marketing, gross	2,690	2,493
Right-to-use contract commissions, deferred, net	(84)	104
Property management	12,560	11,763
Cost of home sales	7,119	8,281
Home selling expenses	925	834
Rental home operating and maintenance	1,551	1,525
Total expenses	170,464	163,838
Income from property operations segment	61,925	56,309
Property Operations
Revenues:
Community base rental income	120,692	114,076
Rental home income	61,068	55,434
Right-to-use annual payments	11,252	11,054
Right-to-use contracts current period, gross	3,206	2,532
Right-to-use contract upfront payments, deferred, net	(775)	(302)
Utility and other income	22,126	20,793
Ancillary services revenues, net	1,419	1,139
Total revenues	218,988	204,726
Expenses:
Property operating and maintenance	68,054	62,954
Real estate taxes	14,037	13,198
Sales and marketing, gross	2,690	2,493
Right-to-use contract commissions, deferred, net	(84)	104
Property management	12,560	11,763
Total expenses	97,257	90,512
Income from property operations segment	121,731	114,214
Home Sales and Rentals Operations
Revenues:
Gross revenue from home sales	7,027	8,214
Brokered resale revenues and ancillary services revenues, net	242	279
Resort base rental income	3,605	3,545
Total revenues	10,874	12,038
Expenses:
Cost of home sales	7,119	8,281
Home selling expenses	925	834
Rental home operating and maintenance	1,551	1,525
Total expenses	9,595	10,640
Income from property operations segment	$ 1,279	$ 1,398