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Derivative Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative [Line Items] |  |
Total Current Assets | $ 107,625 | $ 84,657
Total Other Non-Current Assets | 204,459 | 188,237
Total Current Liabilities | 415,774 | 42,329
Total Non-Current Liabilities | 285,865 | 127,290
Commodity Swap |  |
Derivative [Line Items] |  |
Total Current Assets | 576 | 53,668
Total Other Non-Current Assets | 30,055 | 134,661
Total Current Liabilities | 393,982 | 23,506
Total Non-Current Liabilities | 258,360 | 59,388
Basis Swap |  |
Derivative [Line Items] |  |
Total Current Assets | 106,921 | 30,848
Total Other Non-Current Assets | 173,957 | 52,903
Total Current Liabilities | 18,103 | 14,491
Total Non-Current Liabilities | 21,007 | 57,150
Interest Rate Swap |  |
Derivative [Line Items] |  |
Total Current Assets | 128 | 141
Total Other Non-Current Assets | 447 | 673
Total Current Liabilities | 3,689 | 4,332
Total Non-Current Liabilities | $ 6,498 | $ 10,752

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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://www.xbrl.org/2003/role/disclosureRef -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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