PROPERTY AND EQUIPMENT (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Jun. 15, 2012	Dec. 31, 2011
Property and equipment and related accumulated depreciation and amortization [Abstract]
Property and equipment, gross	$ 635,465,000		$ 635,465,000			$ 565,723,000
Less accumulated depreciation and amortization	(149,080,000)		(149,080,000)			(134,990,000)
Property and equipment, net	486,385,000		486,385,000			430,733,000
Impairment of fixed assets	3,500,000	0	3,500,000	0
Number of real estate properties acquired previously leased					12
Unamortized leasehold improvements reclassified			3,100,000
Land and land improvements [Member]
Property and equipment and related accumulated depreciation and amortization [Abstract]
Property and equipment, gross	38,546,000		38,546,000			32,680,000
Buildings and improvements [Member]
Property and equipment and related accumulated depreciation and amortization [Abstract]
Property and equipment, gross	539,969,000		539,969,000			478,596,000
Property plant and equipment increase decrease in fair market value					57,100,000
Furniture and equipment [Member]
Property and equipment and related accumulated depreciation and amortization [Abstract]
Property and equipment, gross	40,458,000		40,458,000			38,715,000
Leasehold improvements [Member]
Property and equipment and related accumulated depreciation and amortization [Abstract]
Property and equipment, gross	11,034,000		11,034,000			11,009,000
Construction in progress [Member]
Property and equipment and related accumulated depreciation and amortization [Abstract]
Property and equipment, gross	5,458,000		5,458,000			4,723,000
Land [Member]
Property and equipment and related accumulated depreciation and amortization [Abstract]
Property plant and equipment increase decrease in fair market value					5,700,000