PROPERTY AND EQUIPMENT (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property and equipment and related accumulated depreciation and amortization [Abstract]
Property and equipment, gross	$ 637,276,000	$ 565,723,000
Less accumulated depreciation and amortization	(155,363,000)	(134,990,000)
Property and equipment, net	481,913,000	430,733,000
Impairment charge	3,500,000	0	0
Capitalized expansion costs	2,500,000	700,000	5,600,000
Land and Land Improvements [Member]
Property and equipment and related accumulated depreciation and amortization [Abstract]
Property and equipment, gross	39,293,000	32,680,000
Buildings and improvements [Member]
Property and equipment and related accumulated depreciation and amortization [Abstract]
Property and equipment, gross	543,547,000	478,596,000
Furniture and Equipment [Member]
Property and equipment and related accumulated depreciation and amortization [Abstract]
Property and equipment, gross	41,409,000	38,715,000
Leasehold Improvements [Member]
Property and equipment and related accumulated depreciation and amortization [Abstract]
Property and equipment, gross	11,467,000	11,009,000
Construction in Progress [Member]
Property and equipment and related accumulated depreciation and amortization [Abstract]
Property and equipment, gross	$ 1,560,000	$ 4,723,000