Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Investment in real estate:
Land	$ 1,068,236	$ 1,025,246
Land improvements	2,706,662	2,667,213
Buildings and other depreciable property	551,522	535,647
Real Estate Investment Property, at Cost, Total	4,326,420	4,228,106
Accumulated depreciation	(1,143,800)	(1,058,540)
Net investment in real estate	3,182,620	3,169,566
Cash	109,144	58,427
Notes receivable, net	38,051	42,990
Investment in joint ventures	15,414	11,583
Deferred financing costs, net	22,676	19,873
Deferred commission expense	27,885	25,251
Escrow deposits, goodwill, and other assets, net	55,358	64,619
Total Assets	3,451,148	3,392,309
Liabilities:
Mortgage notes payable	2,005,942	1,992,368
Term loan	200,000	200,000
Unsecured lines of credit	0	0
Accrued payroll and other operating expenses	85,879	65,157
Deferred revenue - upfront payments from right-to-use contracts	72,976	68,673
Deferred revenue - right-to-use annual payments	10,762	11,136
Accrued interest payable	8,865	9,416
Rents and other customer payments received in advance and security deposits	60,560	59,601
Distributions payable	29,620	22,753
Total Liabilities	2,474,604	2,429,104
Stockholders' Equity:
Preferred stock value	0	0
Common stock, $0.01 par value	838	834
Paid-in capital	1,028,912	1,021,365
Distributions in excess of accumulated earnings	256,340	264,083
Accumulated other comprehensive loss	141	(927)
Total Stockholders’ Equity	909,695	893,333
Non-controlling interests - Common OP Units	66,849	69,872
Total Equity	976,544	963,205
Total Liabilities and Equity	3,451,148	3,392,309
Cumulative Series C Six Point Seven Five Percent Redeemable Perpetual Preferred Stock [Domain]
Stockholders' Equity:
Preferred stock value	$ 136,144	$ 136,144