Annual report pursuant to Section 13 and 15(d)

3. PROPERTY AND EQUIPMENT (Details)

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3. PROPERTY AND EQUIPMENT (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Abstract]    
Facilities and plant equipment $ 190,714us-gaap_MachineryAndEquipmentGross $ 184,064us-gaap_MachineryAndEquipmentGross
Land 2,570us-gaap_Land 2,570us-gaap_Land
Other equipment, vehicles and furniture 7,641us-gaap_PropertyPlantAndEquipmentOther 5,600us-gaap_PropertyPlantAndEquipmentOther
Construction in progress 8,720us-gaap_ConstructionInProgressGross 5,007us-gaap_ConstructionInProgressGross
Property, Plant and Equipment, Gross 209,645us-gaap_PropertyPlantAndEquipmentGross 197,241us-gaap_PropertyPlantAndEquipmentGross
Accumulated Depreciation (54,343)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (42,047)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, Plant and Equipment, Net $ 155,302us-gaap_PropertyPlantAndEquipmentNet $ 155,194us-gaap_PropertyPlantAndEquipmentNet