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DERIVATIVES. (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
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 September 30, 2019
|  | Assets |  | Liabilities
Type of Instrument |  | Balance Sheet Location |  | Fair Value |  |  | Balance Sheet Location |  | Fair Value |
Cash collateral balance |  | Other current assets |  | $ | 2,400 |  |  |  |  |  |  |
Commodity contracts |  | Derivative instruments |  | $ | 2,790 |  |  | Derivative instruments |  | $ | 3,619 |
|  | 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
| 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, 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 assets |  | $ | 1,765 |  |  | Derivative liabilities |  | $ | 6,309 |
|  | 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 |
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 |
|  |  |  | Three Months Ended September 30, |
Type of Instrument |  | Statements of Operations Location |  | 2019 |  |  | 2018 |
Commodity contracts |  | Cost of goods sold |  | $ | 2,262 |  |  | $ | 916 |
|  |  |  | Unrealized Losses |
|  |  |  | Three Months Ended September 30, |
Type of Instrument |  | Statements of Operations Location |  | 2019 |  |  | 2018 |
Commodity contracts |  | Cost of goods sold |  | $ | (5,582 | ) |  | $ | (1,907 | )
|  |  |  | Realized Losses |
|  |  |  | Nine Months Ended September 30, |
Type of Instrument |  | Statements of Operations Location |  | 2019 |  |  | 2018 |
Commodity contracts |  | Cost of goods sold |  | $ | (2,150 | ) |  | $ | (1,241 | )
|  |  |  | Unrealized Gains (Losses) |
|  |  |  | Nine Months Ended September 30, |
Type of Instrument |  | Statements of Operations Location |  | 2019 |  |  | 2018 |
Commodity contracts |  | Cost of goods sold |  | $ | 3,715 |  |  | $ | (3,121 | )
| 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 |  | 2018 |  |  | 2017 |  |  | 2016 |
Commodity contracts |  | Cost of goods sold |  | $ | (3,479 | ) |  | $ | (4,165 | ) |  | $ | 1,386 |
|  |  |  | $ | (3,479 | ) |  | $ | (4,165 | ) |  | $ | 1,386 |
|  |  |  | Unrealized Gains (Losses) |
|  |  |  | For the Years Ended December 31, |
Type of Instrument |  | Statements of Operations Location |  | 2018 |  |  | 2017 |  |  | 2016 |
Commodity contracts |  | Cost of goods sold |  | $ | (3,235 | ) |  | $ | 2,088 |  |  | $ | (3,370 | )
|  |  |  | $ | (3,235 | ) |  | $ | 2,088 |  |  | $ | (3,370 | )

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