Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flows From Operating Activities:
Consolidated net income	$ 150,512	$ 138,468	$ 125,905
Adjustments to reconcile consolidated net income to net cash provided by operating activities:
Gain on sale of property	0	(1,457)	(41,525)
Early debt retirement	16,913	5,087	37,844
Depreciation	114,698	111,872	110,505
Amortization of in-place leases	(2,358)	(3,999)	(1,940)
Amortization of loan costs	4,216	4,783	5,304
Debt premium amortization	(3,869)	(5,185)	(6,842)
Equity in income of unconsolidated joint ventures	(4,089)	(4,578)	(2,039)
Distributions of income from unconsolidated joint ventures	3,584	3,362	1,311
Distributions, including those in excess of basis	3,700	5,900
Amortization of stock-related compensation	8,582	7,568	5,952
Revenue recognized from right-to-use contract upfront payments	(8,552)	(8,391)	(8,121)
Commission expense recognized related to right-to-use contracts	3,595	2,934	2,601
Long term incentive plan compensation	973	1,900	1,907
Provision for uncollectible rents receivable	537	101	230
Changes in assets and liabilities:
Notes receivable activity, net	66	(1,037)	(123)
Deferred commission expense	(5,871)	(6,272)	(5,011)
Escrow deposits, goodwill and other assets	44,095	22,230	7,180
Accrued expenses and accounts payable	5,632	(5,282)	83
Deferred revenue – upfront payments from right-to-use contracts	12,783	13,892	13,815
Deferred revenue – right-to-use annual payments	88	(1,346)	48
Rents received in advance and security deposits	6,631	3,097	4,385
Net cash provided by operating activities	352,882	285,745	255,349
Cash Flows From Investing Activities:
Real estate acquisition	23,687	81,391	117,707
Proceeds from disposition of property	0	2,102	157,975
Tax-deferred exchange deposit	0	10,576	(11,976)
Investment in unconsolidated joint ventures	(4,000)	(3,489)	(2,641)
Distributions of capital from unconsolidated joint ventures	80	2,580	0
Repayments of notes receivable	(10,490)	(14,899)	(11,552)
Issuance of notes receivable	(9,791)	(9,441)	(10,343)
Capital improvements	(93,799)	(63,721)	(64,714)
Net cash used in investing activities	(120,707)	(127,885)	(37,854)
Cash Flows From Financing Activities:
Net proceeds from stock options and employee stock purchase plan	4,899	1,326	968
Distributions:
Common Stockholders	(122,077)	(102,346)	(62,546)
Common OP Unitholders	(10,470)	(9,123)	(5,648)
Preferred Stockholders	(9,226)	(9,274)	(9,280)
Stock repurchase and unit redemption	(3,201)	(1,870)	(1,121)
Lines of credit:
Lines of credit repayments	0	0	(20,000)
Lines of credit proceeds	0	0	20,000
Principal payments and mortgage debt payoff	(456,308)	(178,040)	(450,492)
New mortgage notes payable financing proceeds	395,323	169,000	375,500
Debt issuance and defeasance costs	(24,080)	(11,651)	(43,031)
Other	(491)	(595)	(544)
Net cash used in financing activities	(225,631)	(142,573)	(196,194)
Net increase in cash and cash equivalents	6,544	15,287	21,301
Supplemental information:
Cash paid during the period for interest	106,423	112,963	120,497
Capital improvements – used homes acquired by repossessions	909	1,431	2,591
Net repayments of notes receivable – used homes acquired by repossessions	(909)	(1,431)	(2,591)
Building and other depreciable property – reclassification of rental homes	28,790	23,494	14,401
Escrow deposits and other assets – reclassification of rental homes	(28,790)	(23,494)	(14,401)
Real estate acquisitions:
Investment in real estate	(23,900)	(122,366)	(133,344)
Deferred financing costs, net	0	(284)	(59)
Escrow deposits and other assets	(53)	(12)	(1,100)
Debt assumed and financed on acquisition	0	34,559	5,382
Accrued expenses and accounts payable	62	1,947	711
Rents and other customer payments received in advance and security deposits	204	4,765	1,017
Non-controlling interest - Common OP Units	0	0	9,686
Proceeds from dispositions of rental property and other:
Investment in real estate	0	87	113,068
Notes receivable, net	0	0	6,507
Other, net	0	(558)	2,167
Gain on sale of property	$ 0	$ 1,457	$ 40,567