Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Investment in real estate:
Land	$ 1,065,368	$ 1,025,246
Land improvements	2,692,191	2,667,213
Buildings and other depreciable property	549,869	535,647
Real Estate Investment Property, at Cost, Total	4,307,428	4,228,106
Accumulated depreciation	(1,116,180)	(1,058,540)
Net investment in real estate	3,191,248	3,169,566
Cash	84,811	58,427
Notes receivable, net	38,208	42,990
Investment in joint ventures	14,709	11,583
Deferred financing costs, net	19,468	19,873
Deferred commission expense	26,585	25,251
Escrow deposits, goodwill, and other assets, net	55,395	64,619
Total Assets	3,430,424	3,392,309
Liabilities:
Mortgage notes payable	1,984,727	1,992,368
Term loan	200,000	200,000
Unsecured lines of credit	0	0
Accrued payroll and other operating expenses	77,800	65,157
Deferred revenue - upfront payments from right-to-use contracts	70,988	68,673
Deferred revenue - right-to-use annual payments	14,178	11,136
Accrued interest payable	9,480	9,416
Rents and other customer payments received in advance and security deposits	68,491	59,601
Distributions payable	29,614	22,753
Total Liabilities	2,455,278	2,429,104
Stockholders' Equity:
Preferred stock value	0	0
Common stock, $0.01 par value	837	834
Paid-in capital	1,025,396	1,021,365
Distributions in excess of accumulated earnings	254,816	264,083
Accumulated other comprehensive loss	0	(927)
Total Stockholders’ Equity	907,561	893,333
Non-controlling interests - Common OP Units	67,585	69,872
Total Equity	975,146	963,205
Total Liabilities and Equity	3,430,424	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