Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows From Operating Activities:
Consolidated net income	$ 241,416	$ 295,922	$ 226,386
Adjustments to reconcile consolidated net income to net cash provided by operating activities:
Gain on sale of real estate, net	0	(52,507)	0
Early debt retirement	10,786	1,491	1,071
Depreciation and amortization	157,760	153,980	138,688
Amortization of loan costs	3,473	3,479	3,564
Debt premium amortization	(394)	(483)	(2,259)
Equity in income of unconsolidated joint ventures	(5,399)	(8,755)	(4,939)
Distributions of income from unconsolidated joint ventures	95	5,133	4,122
Proceeds from insurance claims, net	(1,697)	(3,530)	(8,525)
Compensation expense related to restricted stock and stock options	11,527	10,481	9,995
Revenue recognized from membership upgrade sales upfront payments	(9,675)	(8,660)	(7,811)
Commission expense recognized related to membership sales	3,673	3,667	3,609
Long-term incentive plan compensation	1,531	(2,843)	1,176
Changes in assets and liabilities:
Notes receivable, net	(1,166)	(2,836)	(247)
Deferred commission expense	(4,995)	(4,508)	(4,274)
Other assets, net	34,048	11,621	26,898
Accounts payable and other liabilities	3,386	15,578	9,615
Deferred revenue	12,064	10,451
Rents and other customer payments received in advance and security deposits	(786)	6,635	1,701
Net cash provided by operating activities	466,537	443,520	414,084
Cash Flows From Investing Activities:
Real estate acquisitions, net	239,067	185,411	234,108
Proceeds from disposition of properties, net	0	77,746	0
Investment in unconsolidated joint ventures	0	(983)	(4,497)
Distributions of capital from unconsolidated joint ventures	5,648	6,352	396
Proceeds from insurance claims	122	8,200	7,943
Repayments of notes receivable	0	0	13,823
Issuance of notes receivable	0	0	0
Capital improvements	(217,082)	(257,993)	(181,622)
Net cash used in investing activities	(450,379)	(352,089)	(398,065)
Cash Flows From Financing Activities:
Proceeds from stock options and employee stock purchase plan	2,027	2,482	5,813
Gross proceeds from the issuance of common stock	0	59,319	78,755
Distributions:
Common Stockholders	(242,948)	(216,098)	(190,211)
Common OP Unitholders	(13,983)	(13,104)	(12,411)
Preferred Stockholders	(16)	(16)	(16)
Share based award tax withholding payments	(3,962)	(53)	(2,958)
Principal payments and mortgage debt repayment	(468,278)	(121,028)	(245,335)
Mortgage notes payable financing proceeds	662,309	0	421,774
Line of Credit repayment	(390,500)	(155,500)	(284,000)
Line of Credit proceeds	452,500	315,500	254,000
Debt issuance and defeasance costs	(17,434)	(1,700)	(6,436)
Redemption of preferred stock	0	0	0
Other	(673)	(1,347)	(1,651)
Net cash (used in) provided by financing activities	(20,958)	(131,545)	17,324
Net increase (decrease) in cash and restricted cash	(4,800)	(40,114)	33,343
Cash and restricted cash, beginning of period	28,860	68,974	35,631
Cash and restricted cash, end of period	24,060	28,860	68,974
Supplemental information:
Cash paid for interest	100,686	102,027	102,377
Net investment in real estate – reclassification of rental homes	38,845	28,260	30,799
Other assets, net – reclassification of rental homes	(38,845)	(28,260)	(30,799)
Real estate acquisitions:
Investment in real estate	(248,100)	(249,197)	(265,129)
Investment in unconsolidated joint ventures	0	35,789	0
Other assets, net	(153)	(1,646)	(59)
Debt assumed	6,873	19,212	9,200
Debt financed	0	0	8,786
Other liabilities	2,313	10,431	13,094
Real estate acquisitions, net	(239,067)	(185,411)	(234,108)
Real estate dispositions:
Investment in real estate	0	35,572	0
Notes receivable, net	0	295	0
Other assets, net	0	97	0
Mortgage notes payable, net	0	(11,175)	0
Other liabilities	0	450	0
Gain on sale of real estate, net	0	52,507	0
Real estate dispositions, net	0	77,746	0
Deferred revenue – upfront payments from membership upgrade sales
Changes in assets and liabilities:
Deferred revenue	21,739	19,111	15,191
Deferred revenue – annual membership subscriptions
Changes in assets and liabilities:
Deferred revenue	$ 1,215	$ 544	$ 123