Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows From Operating Activities:
Consolidated net income	$ 295,922	$ 226,386	$ 210,377
Adjustments to reconcile consolidated net income to net cash provided by operating activities:
Gain on sale of real estate, net	(52,507)	0	0
Early debt retirement	1,491	1,071	2,785
Depreciation and amortization	153,980	138,688	124,951
Amortization of loan costs	3,479	3,564	3,546
Debt premium amortization	(483)	(2,259)	(2,211)
Equity in income of unconsolidated joint ventures	(8,755)	(4,939)	(3,765)
Distributions of income from unconsolidated joint ventures	5,133	4,122	3,003
Proceeds from insurance claims, net	(3,530)	(8,525)	(2,722)
Compensation expense related to restricted stock and stock options	10,481	9,995	9,352
Revenue recognized from membership upgrade sales upfront payments	(8,660)	(7,811)	(10,020)
Commission expense recognized related to membership sales	3,667	3,609	4,509
Long-term incentive plan compensation	(2,843)	1,176	1,347
Changes in assets and liabilities:
Notes receivable, net	(2,836)	(247)	(1,510)
Deferred commission expense	(4,508)	(4,274)	(4,577)
Other assets, net	11,621	26,898	31,056
Accounts payable and other liabilities	15,578	9,615	(4,735)
Deferred revenue	10,451	7,380
Rents and other customer payments received in advance and security deposits	6,635	1,701	2,354
Net cash provided by operating activities	443,520	414,084	377,987
Cash Flows From Investing Activities:
Real estate acquisitions, net	185,411	234,108	136,552
Proceeds from disposition of properties, net	77,746	0	0
Investment in unconsolidated joint ventures	(983)	(4,497)	(33,345)
Distributions of capital from unconsolidated joint ventures	6,352	396	789
Proceeds from insurance claims	8,200	7,943	3,626
Repayments of notes receivable	0	13,823	0
Issuance of notes receivable	0	0	(13,823)
Capital improvements	(257,993)	(181,622)	(126,050)
Net cash used in investing activities	(352,089)	(398,065)	(305,355)
Cash Flows From Financing Activities:
Proceeds from stock options and employee stock purchase plan	2,482	5,813	6,911
Gross proceeds from the issuance of common stock	59,319	78,755	120,698
Distributions:
Common Stockholders	(216,098)	(190,211)	(163,770)
Common OP Unitholders	(13,104)	(12,411)	(11,631)
Preferred Stockholders	(16)	(16)	(6,928)
Share based award tax withholding payments	(53)	(2,958)	(3,087)
Principal payments and mortgage debt repayment	(121,028)	(245,335)	(270,530)
Mortgage notes payable financing proceeds	0	421,774	350,369
Line of Credit payoff	(155,500)	(284,000)	(101,000)
Line of Credit proceeds	315,500	254,000	131,000
Debt issuance and defeasance costs	(1,700)	(6,436)	(12,567)
Redemption of preferred stock	0	0	(136,314)
Other	(1,347)	(1,651)	(1,947)
Net cash provided by (used in) financing activities	(131,545)	17,324	(98,796)
Net increase (decrease) in cash and restricted cash	(40,114)	33,343	(26,164)
Cash and restricted cash, beginning of period	68,974	35,631	61,795
Cash and restricted cash, end of period	28,860	68,974	35,631
Supplemental information:
Cash paid for interest	102,027	102,377	102,570
Net investment in real estate – reclassification of rental homes	28,260	30,799	30,732
Other assets, net – reclassification of rental homes	(28,260)	(30,799)	(30,732)
Real estate acquisitions:
Investment in real estate	(249,197)	(265,129)	(142,255)
Investment in unconsolidated joint ventures	35,789	0	0
Other assets, net	(1,646)	(59)	(229)
Debt assumed	19,212	9,200	5,900
Debt financed	0	8,786	0
Other liabilities	10,431	13,094	32
Real estate acquisitions, net	(185,411)	(234,108)	(136,552)
Real estate dispositions:
Investment in real estate	35,572	0	0
Notes receivable, net	295	0	0
Other assets, net	97	0	0
Mortgage notes payable, net	(11,175)	0	0
Other liabilities	450	0	0
Gain on sale of real estate, net	52,507	0	0
Real estate dispositions, net	77,746	0	0
Deferred revenue – upfront payments from membership upgrade sales
Changes in assets and liabilities:
Deferred revenue	19,111	15,191	14,132
Deferred revenue – annual membership subscriptions
Changes in assets and liabilities:
Deferred revenue	$ 544	$ 123	$ 115