Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Investment in real estate:
Land	$ 1,018,508	$ 1,018,521
Land improvements	2,600,093	2,591,225
Buildings and other depreciable property	492,221	469,627
Real Estate Investment Property, at Cost, Total	4,110,822	4,079,373
Accumulated depreciation	(903,183)	(813,926)
Net investment in real estate	3,207,639	3,265,447
Cash and cash equivalents	134,967	70,460
Notes receivable, net	56,297	64,239
Investment in joint ventures	8,596	8,557
Rent and other customer receivables, net	927	1,155
Deferred financing costs, net	21,093	23,039
Inventory	3,034	2,948
Deferred commission expense	20,584	19,687
Escrow deposits and other assets	45,513	40,569
Total Assets	3,498,650	3,496,101
Liabilities:
Mortgage notes payable	2,088,450	2,084,683
Term loan	200,000	200,000
Unsecured lines of credit
Accrued payroll and other operating expenses	67,770	62,062
Deferred revenue - upfront payments from right-to-use contracts	58,176	56,285
Deferred revenue - right-to-use annual payments	16,024	11,877
Accrued interest payable	10,227	10,737
Rents and other customer payments received in advance and security deposits	59,130	54,234
Distributions payable	19,811	16,943
Total Liabilities	2,519,588	2,496,821
Commitments and contingencies:
8.034% Series A Cumulative Redeemable Perpetual Preferred Stock, $0.01 par value, 8,000,000 shares authorized, issued and outstanding as of December 31, 2011, at liquidation value		200,000
Stockholders' Equity:
Preferred stock value
Common stock, $0.01 par value 100,000,000 shares authorized; 41,327,663 and 41,078,200 shares issued and outstanding as of June 30, 2012 and December 31, 2011, respectively	413	412
Paid-in capital	1,005,289	998,483
Distributions in excess of accumulated earnings	(291,673)	(270,021)
Accumulated other comprehensive loss	(2,959)	(2,547)
Total Stockholders' Equity	911,070	726,327
Non-controlling interests - Common OP Units	67,992	72,953
Total Equity	979,062	799,280
Total Liabilities and Equity	3,498,650	3,496,101
8.034% Series A Cumulative Redeemable Perpetual Preferred Stock
Stockholders' Equity:
Preferred stock value	$ 200,000