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Derivative Instruments - Schedule of Derivative Instruments in Statement of Financial Position (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Derivative [Line Items] |  |
Total short-term derivative instruments – asset | $ 27,146 | $ 126,201
Total long-term derivative instruments – asset | 322 | 563
Total short-term derivative instruments – liability | 11,641 | 303
Total long-term derivative instruments – liability | 36,604 | 53,135
Commodity derivative instruments |  |
Derivative [Line Items] |  |
Total short-term derivative instruments – asset | 27,146 | 125,383
Total long-term derivative instruments – asset | 322 | 0
Contingent consideration arrangement |  |
Derivative [Line Items] |  |
Total short-term derivative instruments – asset | 0 | 818
Total long-term derivative instruments – asset | $ 0 | $ 563

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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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