Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues:
Community base rental income	$ 489,613	$ 464,745	$ 442,046
Rental home income	14,344	14,107	14,012
Resort base rental income	218,806	201,533	184,760
Right-to-use annual payments	45,798	45,035	44,443
Right-to-use contracts current period, gross	14,132	12,327	12,783
Right-to-use contract upfront payments, deferred, net	(4,108)	(3,079)	(4,231)
Utility and other income	93,252	81,427	76,153
Gross revenues from home sales	36,302	37,191	33,150
Brokered resale revenues and ancillary services revenues, net	3,798	2,994	4,149
Interest income	7,580	6,845	7,030
Income from other investments, net	5,795	7,310	7,359
Total revenues	925,312	870,435	821,654
Expenses:
Property operating and maintenance	294,119	268,249	254,668
Rental home operating and maintenance	6,610	6,883	7,167
Real estate taxes	55,010	53,036	50,962
Sales and marketing, gross	11,438	11,056	11,751
Right-to-use contract commissions, deferred, net	(354)	(223)	(1,556)
Property management	51,252	47,083	44,528
Depreciation on real estate assets and rental homes	121,455	117,400	113,609
Amortization of in-place leases	2,231	3,373	2,358
Cost of home sales	36,513	37,456	32,279
Home selling expenses	4,186	3,575	3,191
General and administrative	31,737	31,004	30,644
Other expenses, including property rights initiatives	1,148	4,986	2,986
Early debt retirement	2,785	0	16,913
Interest and related amortization	100,570	102,030	105,731
Total property operations expenses	718,700	685,908	675,231
Income before equity in income of unconsolidated joint ventures	206,612	184,527	146,423
Equity in income of unconsolidated joint ventures	3,765	2,605	4,089
Consolidated net income	210,377	187,132	150,512
Income allocated to non-controlling interests – Common OP Units	(12,788)	(13,869)	(11,141)
Perpetual preferred stock dividends and original issuance costs	(7,685)	(9,226)	(9,226)
Net income available for Common Stockholders	189,904	164,037	130,145
Other comprehensive income (loss) (OCI):
Adjustment for fair market value of swap	1,169	326	(172)
Consolidated comprehensive income	211,546	187,458	150,340
Comprehensive income allocated to non-controlling interests – Common OP Units	(12,813)	(13,893)	(11,126)
Series C Redeemable Perpetual Preferred Stock Dividends	(7,685)	(9,226)	(9,226)
Comprehensive income attributable to Common Stockholders	$ 191,048	$ 164,339	$ 129,988
Earnings per Common Share – Basic:
Net income available for Common Stockholders (usd per share)	$ 2.18	$ 1.93	$ 1.55
Earnings per Common Share – Fully Diluted:
Net income available for Common Stockholders (usd per share)	$ 2.17	$ 1.92	$ 1.54
Weighted average Common Shares outstanding – basic (shares)	86,997	84,778	84,031
Weighted average Common Shares outstanding – fully diluted (shares)	93,425	92,569	91,907
6.75% Series C Cumulative Redeemable Perpetual Preferred Stock
Expenses:
Perpetual preferred stock dividends and original issuance costs	$ (7,685)	$ (9,226)	$ (9,226)
Other comprehensive income (loss) (OCI):
Series C Redeemable Perpetual Preferred Stock Dividends	$ (7,685)	$ (9,226)	$ (9,226)