DERIVATIVES. (Details) - Non Designated Derivative Instruments [Member] - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Cash Collateral Balance [Member] | ||
| Derivative assets | $ 3,813 | $ 4,331 |
| Commodity Contracts [Member] | ||
| Derivative assets | 998 | 978 |
| Derivative liabilities | $ 2,307 | $ 4,115 |
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- Definition Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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