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DERIVATIVES. (Tables) | 12 Months Ended
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Dec. 31, 2017
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 December 31, 2017 |
|  | Assets |  |  | Liabilities |
Type of Instrument |  | Balance Sheet Location |  | Fair Value |  |  | Balance Sheet Location |  | Fair Value |
Cash collateral balance |  | Other current assets |  | $ | 3,813 |  |  |  |  |  |  |
Commodity contracts |  | Derivative assets |  | $ | 998 |  |  | Derivative liabilities |  | $ | 2,307 |
|  | As of December 31, 2016 |
|  | Assets |  |  | Liabilities |
Type of Instrument |  | Balance Sheet Location |  | Fair Value |  |  | Balance Sheet Location |  | Fair Value |
Cash collateral balance |  | Other current assets |  | $ | 4,331 |  |  |  |  |  |  |
Commodity contracts |  | Derivative assets |  | $ | 978 |  |  | Derivative liabilities |  | $ | 4,115 |
Schedule of recognized gains (losses) on 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 Gains (Losses) |
|  |  |  | For the Years Ended December 31, |
Type of Instrument |  | Statements of Operations Location |  | 2017 |  |  | 2016 |  |  | 2015 |
Commodity contracts |  | Cost of goods sold |  | $ | (4,165 | ) |  | $ | 1,386 |  |  | $ | (338 | )
|  |  |  | $ | (4,165 | ) |  | $ | 1,386 |  |  | $ | (338 | )
|  |  |  | Unrealized Gains (Losses) |
|  |  |  | For the Years Ended December 31, |
Type of Instrument |  | Statements of Operations Location |  | 2017 |  |  | 2016 |  |  | 2015 |
Commodity contracts |  | Cost of goods sold |  | $ | 2,088 |  |  | $ | (3,370 | ) |  | $ | (204 | )
|  |  |  | $ | 2,088 |  |  | $ | (3,370 | ) |  | $ | (204 | )

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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Definition Tabular disclosure for other derivative instruments not designated as hedging instruments of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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