Annual report pursuant to Section 13 and 15(d)

5. DERIVATIVES (Details-Fair value)

v2.4.1.9
5. DERIVATIVES (Details-Fair value) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Other current assets $ 1,586us-gaap_DerivativeAssetFairValueOfCollateral $ 961us-gaap_DerivativeAssetFairValueOfCollateral
Accrued liabilities 1,149us-gaap_DerivativeLiabilityFairValueOfCollateral 859us-gaap_DerivativeLiabilityFairValueOfCollateral
Non Designated Derivative Instruments [Member] | Commodity contracts [Member] | Other Current Assets [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Other current assets 1,586us-gaap_DerivativeAssetFairValueOfCollateral
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember 		961us-gaap_DerivativeAssetFairValueOfCollateral
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Accrued liabilities $ 1,149us-gaap_DerivativeLiabilityFairValueOfCollateral
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember 		$ 859us-gaap_DerivativeLiabilityFairValueOfCollateral
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember