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DERIVATIVES. (Tables) | 3 Months Ended
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Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of derivatives not designated as hedging instruments | The classification and amounts of the Company’s derivatives not designated as hedging instruments, and related cash collateral balances, are as follows (in thousands):
|  | As of March 31, 2019 |
|  | Assets |  |  | Liabilities |
Type of Instrument |  | Balance Sheet Location |  |  | Fair Value |  |  | Balance Sheet Location |  |  | Fair Value |
Cash collateral balance |  | Other current assets |  | $ | 4,409 |  |  |  |  |  |  |
Commodity contracts |  | Derivative instruments |  | $ | 1,155 |  |  | Derivative instruments |  | $ | 5,156 |
|  | As of December 31, 2018 |
|  | Assets |  |  | Liabilities |
Type of Instrument |  | Balance Sheet Location |  |  | Fair Value |  |  | Balance Sheet Location |  |  | Fair Value |
Cash collateral balance |  | Other current assets |  | $ | 8,479 |  |  |  |  |  |  |
Commodity contracts |  | Derivative instruments |  | $ | 1,765 |  |  | Derivative instruments |  | $ | 6,309 |
Schedule of recognized gains (losses) for derivatives | The classification and amounts of the Company’s recognized gains (losses) for its derivatives not designated as hedging instruments are as follows (in thousands):
|  |  |  | Realized Losses |
|  |  |  | Three Months Ended March 31, |
Type of Instrument |  | Statements of Operations Location |  | 2019 |  |  | 2018 |
Commodity contracts |  | Cost of goods sold |  | $ | (630 | ) |  | $ | (1,658 | )
|  |  |  | Unrealized Gains |
|  |  |  | Three Months Ended March 31, |
Type of Instrument |  | Statements of Operations Location |  | 2019 |  |  | 2018 |
Commodity contracts |  | Cost of goods sold |  | $ | 544 |  |  | $ | 1,196 |

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4E -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624181-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure of derivative instrument not designated or qualifying as hedging instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 + Details
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