Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Investment in real estate:
Land	$ 1,018,521	$ 544,462
Land improvements	2,591,225	1,762,122
Buildings and other depreciable property	469,627	278,403
Real Estate Investment Property, at Cost, Total	4,079,373	2,584,987
Accumulated depreciation	(813,926)	(700,665)
Net investment in real estate	3,265,447	1,884,322
Cash and cash equivalents	70,460	12,659
Short-term investments		52,266
Notes receivable, net	64,239	25,726
Investment in joint ventures	8,557	8,446
Rents and other customer receivables, net	1,155	419
Deferred financing costs, net	23,039	10,688
Inventory	2,948	3,177
Deferred commission expense	19,687	14,898
Escrow deposits and other assets	40,569	35,794
Total Assets	3,496,101	2,048,395
Liabilities:
Mortgage notes payable	2,084,683	1,412,919
Term loan	200,000
Unsecured lines of credit
Accrued payroll and other operating expenses	62,062	52,782
Deferred revenue-upfront payments from right-to-use contracts	56,285	44,349
Deferred revenue-right-to-use annual payments	11,877	12,642
Accrued interest payable	10,737	7,174
Rents and other customer payments received in advance and security deposits	54,234	47,738
Distributions payable	16,943	10,633
Total Liabilities	2,496,821	1,588,237
Commitments and contingencies
Non-controlling interests-Perpetual Preferred OP Units		200,000
Stockholders' Equity:
Preferred stock, $.01 par value 2,000,000 shares authorized; none issued and outstanding as of December 31, 2011 and 2010
Common stock, $.01 par value 100,000,000 shares authorized for 2011 and 2010; 41,078,200 and 30,972,353 shares issued and outstanding for 2011 and 2010, respectively	412	310
Paid-in capital	998,483	463,722
Distributions in excess of accumulated earnings	(270,021)	(237,002)
Accumulated other comprehensive loss	(2,547)
Total Stockholders' Equity	726,327	227,030
Non-controlling interests-Common OP Units	72,953	33,128
Total Equity	799,280	260,158
Total Liabilities and Equity	3,496,101	2,048,395
8.034% Series A Cumulative Redeemable Perpetual Preferred Stock
Stockholders' Equity:
Cumulative Redeemable Preferred Stock	$ 200,000