Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash Flows From Operating Activities:
Consolidated net income	$ 37,286	$ 32,494
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on discontinued real estate and other		231
Depreciation expense	37,387	36,395
Amortization expense	2,263	1,744
Debt premium amortization	(10)	(3)
Equity in income of unconsolidated joint ventures	(1,938)	(2,009)
Distributions from unconsolidated joint ventures	1,332	829
Amortization of stock-related compensation	2,969	2,465
Revenue recognized from right-to-use contract upfront payments	(2,800)	(2,119)
Commission expense recognized related to right-to-use contracts	909	638
Accrued long term incentive plan compensation	544	181
Increase in provision for uncollectible rents receivable	608	96
Fair market value adjustment of swap	(336)
Changes in assets and liabilities:
Notes receivable activity, net	189	87
Rent and other customer receivables, net	(670)
Inventory	1,742	2,042
Deferred commission expense	(3,256)	(3,708)
Escrow deposits and other assets	(6,550)	2,519
Accrued payroll and other operating expenses	8,284	9,838
Deferred revenue - upfront payments from right-to-use contracts	8,710	10,618
Deferred revenue - right-to-use annual payments	4,192	5,065
Rents received in advance and security deposits	4,414	2,076
Net cash provided by operating activities	95,269	99,479
Cash Flows From Investing Activities:
Net tax-deferred exchange withdrawal		786
Proceeds from redemption of matured short-term investments	52,266
Net (borrowings) repayment of notes receivable	(2,832)	758
Acquisition escrow deposit	(300,000)
Capital improvements	(24,478)	(20,404)
Net cash used in investing activities	(275,044)	(18,860)
Cash Flows From Financing Activities:
Net proceeds from stock options and employee stock purchase plan	673	1,451
Net proceeds from issuance of Common Stock	344,049
Distributions to Common Stockholders, Common OP Unitholders, Perpetual Preferred OP Unitholders and Redeemable Perpetual Preferred Stockholders	(32,038)	(29,282)
Stock repurchase and Unit redemption	(216)	(399)
Acquisition of non-controlling interests		(1,453)
Principal payments and mortgage debt payoff	(56,281)	(119,610)
New financing proceeds		76,615
Debt issuance costs	(3,727)	(1,264)
Net cash provided by (used in) financing activities	252,460	(73,942)
Net increase in cash and cash equivalents	72,685	6,677
Cash and cash equivalents, beginning of period	12,659	145,128
Cash and cash equivalents, end of period	85,344	151,805
Supplemental Information:
Cash paid during the period for interest	41,228	44,957
Non-cash activities:
Manufactured homes acquired with dealer financing	830	2,268
Dealer financing	(830)	(2,268)
Capital improvements	252	365
Net repayments of notes receivable	(252)	(365)
Series A Cumulative Redeemable Perpetual Preferred Stock	200,000
Perpetual Preferred OP Units conversion	(200,000)
Acquisitions:
Escrow deposits and other assets		(10)
Notes receivable		(2,355)
Investment in real estate		2,365
Dispositions:
Other assets and liabilities, net		(97)
Investment in real estate		(3,531)
Mortgage notes payable assumed by purchaser		$ (3,628)