SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Property and Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	$ 39,801	$ 41,585
Less accumulated depreciation and amortization	25,649	24,022
Property and equipment, net	14,152	17,563
Depreciation expense	2,400	2,700
Cost of Sales [Member]
Property, Plant and Equipment, Net [Abstract]
Depreciation expense	2,200	2,400
General and Administrative Expense [Member]
Property, Plant and Equipment, Net [Abstract]
Depreciation expense	200	300
Land [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	4,993	5,745
Equipment and vehicles [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	$ 25,363	25,181
Equipment and vehicles [Member] | Minimum [Member]
Property, Plant and Equipment, Net [Abstract]
Life	1 year
Equipment and vehicles [Member] | Maximum [Member]
Property, Plant and Equipment, Net [Abstract]
Life	10 years
Office equipment [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	$ 1,624	2,057
Office equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Net [Abstract]
Life	1 year
Office equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Net [Abstract]
Life	7 years
Rental equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Net [Abstract]
Life	3 years
Rental equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Net [Abstract]
Life	5 years
Building and leasehold improvements [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	$ 7,821	$ 8,602
Building and leasehold improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Net [Abstract]
Life	5 years
Building and leasehold improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Net [Abstract]
Life	40 years