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DERIVATIVE INSTRUMENTS (Derivative Instruments in Financial Position) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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General Discussion of Derivative Instruments and Hedging Activities [Abstract] |  |
Short-term derivative instruments - asset | $ 17,958 | $ 21,352
Long-term derivative instruments - asset | 0 | 0
Short-term derivative instruments - liability | 25,921 | 20,401
Long-term derivative instruments - liability | $ 287 | $ 13,992

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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