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Derivative Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Derivative [Line Items] |  |
Total Current Assets | $ 84,657 | $ 247,794
Total Other Non-Current Assets | 188,237 | 314,096
Total Current Liabilities | 42,329 | 41,466
Total Non-Current Liabilities | 127,290 | 115,862
Commodity Swaps |  |
Derivative [Line Items] |  |
Total Current Assets | 53,668 | 234,238
Total Other Non-Current Assets | 134,661 | 288,543
Total Current Liabilities | 23,506 | 345
Total Non-Current Liabilities | 59,388 | 9,693
Basis Only Swaps |  |
Derivative [Line Items] |  |
Total Current Assets | 30,848 | 13,556
Total Other Non-Current Assets | 52,903 | 25,553
Total Current Liabilities | 14,491 | 40,626
Total Non-Current Liabilities | 57,150 | 105,445
Interest Rate Swaps |  |
Derivative [Line Items] |  |
Total Current Assets | 141 | 0
Total Other Non-Current Assets | 673 | 0
Total Current Liabilities | 4,332 | 495
Total Non-Current Liabilities | $ 10,752 | $ 724

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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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