Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Rental income	$ 923,743	$ 879,635	$ 821,114
Revenue from contract with customer	21,739	19,111
Other income	46,008	43,063	51,935
Interest income	7,154	7,207	7,525
Income from other investments, net	4,026	9,528	10,842
Total revenues	1,091,448	1,037,256	986,653
Expenses:
Property operating and maintenance	354,340	333,520	319,839
Real estate taxes	66,120	62,338	55,892
Sales and marketing, gross	17,332	15,583	12,542
Membership sales commissions, deferred, net	(1,660)	(1,219)	(813)
Depreciation and amortization	155,131	152,110	137,209
Home selling expenses	4,572	4,401	4,095
General and administrative	39,276	35,679	37,684
Other expenses	2,567	2,865	1,483
Early debt retirement	10,786	1,491	1,071
Interest and related amortization	102,771	104,223	104,993
Total expenses	855,431	802,596	765,206
Gain on sale of real estate, net	0	52,507	0
Income before equity in income of unconsolidated joint ventures	236,017	287,167	221,447
Equity in income of unconsolidated joint ventures	5,399	8,755	4,939
Consolidated net income	241,416	295,922	226,386
Income allocated to non-controlling interests – Common OP Units	(13,132)	(16,783)	(13,774)
Net income available for Common Stockholders	228,268	279,123	212,596
Other comprehensive income (loss):
Adjustment for fair market value of swap	380	(2,679)	1,357
Consolidated comprehensive income	241,796	293,243	227,743
Comprehensive income allocated to non-controlling interests – Common OP Units	(13,154)	(16,633)	(13,861)
Comprehensive income attributable to Common Stockholders	$ 228,626	$ 276,594	$ 213,866
Earnings per Common Share – Basic (usd per share)	$ 1.26	$ 1.54	$ 1.19
Earnings per Common Share – Fully Diluted (usd per share)	$ 1.25	$ 1.54	$ 1.19
Weighted average Common Shares outstanding – Basic (shares)	181,828	180,805	177,928
Weighted average Common Shares outstanding – Fully Diluted (shares)	192,555	191,995	190,110
Redeemable Perpetual Preferred  Stock
Expenses:
Redeemable perpetual preferred stock dividends	$ (16)	$ (16)	$ (16)
Other comprehensive income (loss):
Redeemable perpetual preferred stock dividends	(16)	(16)	(16)
Deferred revenue – annual membership subscriptions
Revenues:
Revenue from contract with customer	53,085	51,015	47,778
Membership upgrade sales current period, gross
Revenues:
Revenue from contract with customer	21,739	19,111	15,191
Membership upgrade sales upfront payments, deferred, net
Revenues:
Revenue from contract with customer	(12,062)	(10,451)	(7,380)
Gross revenues from home sales
Revenues:
Revenue from contract with customer	45,695	34,655	36,064
Expenses:
Cost of goods and services sold	46,229	35,096	37,475
Brokered resale and ancillary services revenues, net
Revenues:
Revenue from contract with customer	2,060	3,493	3,584
Property management
Expenses:
Cost of goods and services sold	$ 57,967	$ 56,509	$ 53,736