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Derivative Instruments - Schedule of Derivative Instruments in Statement of Financial Position (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Short-term derivative instruments - asset | $ 21,352 | $ 78,847
Long-term derivative instruments | 0 | 8,685
Short-term derivative instruments - liability | 20,401 | 32,534
Long-term derivative instruments - liability | $ 13,992 | $ 2,989

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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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