SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 7,419	$ 6,748	$ 7,543
Construction commitments	1,400
Summary of the categories of property and equipment
Property, Plant and Equipment, Gross	181,861	162,516
Accumulated depreciation	(124,870)	(118,667)
Net property and equipment before construction in progress	56,991	43,849
Capital improvements in progress	1,002	813
Property, Plant and Equipment, net of accumulated depreciation	57,993	44,662
Deferred Revenue
Current - accrued compensation and other current liabilities	306	191
Long-term - other long term liabilities	0	10
Land Improvements [Member]
Summary of the categories of property and equipment
Property, Plant and Equipment, Gross	$ 16,764	12,020
Land Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Tangible assets amortization period	15 years
Land Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Tangible assets amortization period	0 years
Building [Member]
Summary of the categories of property and equipment
Property, Plant and Equipment, Gross	$ 22,711	21,836
Building [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Tangible assets amortization period	40 years
Building [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Tangible assets amortization period	20 years
Equipment [Member]
Summary of the categories of property and equipment
Property, Plant and Equipment, Gross	$ 108,399	97,509
Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Tangible assets amortization period	40 years
Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Tangible assets amortization period	3 years
Furniture and Fixtures [Member]
Summary of the categories of property and equipment
Property, Plant and Equipment, Gross	$ 10,868	9,906
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Tangible assets amortization period	10 years
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Tangible assets amortization period	5 years
Leaseholds and Leasehold Improvements [Member]
Summary of the categories of property and equipment
Property, Plant and Equipment, Gross	$ 23,119	$ 21,245