SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 9,903	$ 10,325	$ 11,363
Summary of the categories of property and equipment
Property, Plant and Equipment, Gross	198,329	197,303
Accumulated depreciation	(148,605)	(140,908)
Net property and equipment before construction in progress	49,724	56,395
Capital improvements in progress	1,953	1,973
Property, Plant and Equipment, net of accumulated depreciation	51,677	58,368
Deferred Revenue
Current - accrued compensation and other current liabilities	291	147
Long-term - other long term liabilities	125	5
Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Tangible assets amortization period minimum	0
Tangible assets amortization period maximum	15
Summary of the categories of property and equipment
Property, Plant and Equipment, Gross	16,640	16,617
Building [Member]
Property, Plant and Equipment [Line Items]
Tangible assets amortization period minimum	20
Tangible assets amortization period maximum	20
Summary of the categories of property and equipment
Property, Plant and Equipment, Gross	21,535	21,547
Equipment [Member]
Property, Plant and Equipment [Line Items]
Tangible assets amortization period minimum	3
Tangible assets amortization period maximum	20
Summary of the categories of property and equipment
Property, Plant and Equipment, Gross	123,979	122,626
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Tangible assets amortization period minimum	5
Tangible assets amortization period maximum	10
Summary of the categories of property and equipment
Property, Plant and Equipment, Gross	14,690	15,152
Leaseholds and Leasehold Improvements [Member]
Summary of the categories of property and equipment
Property, Plant and Equipment, Gross	$ 21,485	$ 21,361