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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2021
Fair Value Disclosures [Abstract] |
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value | The following tables present the fair value hierarchy for assets and liabilities measured at fair value, on a recurring basis (in thousands):
|  |  | Fair Value Measurements at September 30, 2021 using: |
|  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Total Carrying Value as of September 30, 2021 |
Trading securities held in the deferred compensation plans |  | $ | 66,833 |  |  | $ | — |  |  | $ | — |  |  | $ | 66,833 |
Commodity price derivatives | –swaps |  |  | — |  |  |  | (401,955 | ) |  |  | — |  |  |  | (401,955 | )
| –collars |  |  | — |  |  |  | (93,225 | ) |  |  | (10,312 | ) |  |  | (103,537 | )
| –three-way collars |  |  | — |  |  |  | (200,477 | ) |  |  | — |  |  |  | (200,477 | )
| –calls |  |  | — |  |  |  | (10,018 | ) |  |  |  |  |  | (10,018 | )
| –basis swaps |  |  | — |  |  |  | 8,867 |  |  |  | — |  |  |  | 8,867 |
| –swaptions |  |  | — |  |  |  | — |  |  |  | (60,132 | ) |  |  | (60,132 | )
Derivatives–freight swaps |  |  |  | — |  |  |  | (26 | ) |  |  | — |  |  |  | (26 | )
Divestiture contingent consideration |  |  | — |  |  |  | 50,220 |  |  |  | — |  |  |  | 50,220 |
|  |  | Fair Value Measurements at December 31, 2020 using: |
|  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Total Carrying Value as of December 31, 2020 |
Trading securities held in the deferred compensation plans |  | $ | 63,942 |  |  | $ | — |  |  | $ | — |  |  | $ | 63,942 |
Commodity price derivatives | –swaps |  |  | — |  |  |  | 6,642 |  |  |  | — |  |  |  | 6,642 |
| –calls |  |  | — |  |  |  | — |  |  |  | (546 | ) |  |  | (546 | )
| –collars |  |  | — |  |  |  | 7,016 |  |  |  | (3,487 | ) |  |  | 3,529 |
| –three-way collars |  |  | — |  |  |  | (17,818 | ) |  |  | — |  |  |  | (17,818 | )
| –basis swaps |  |  | — |  |  |  | 4,491 |  |  |  | — |  |  |  | 4,491 |
| –swaptions |  |  | — |  |  |  | — |  |  |  | (9,803 | ) |  |  | (9,803 | )
Derivatives–freight swaps |  |  |  | — |  |  |  | 1,104 |  |  |  | — |  |  |  | 1,104 |
Divesture contingent consideration |  |  | — |  |  |  | 15,960 |  |  |  | — |  |  |  | 15,960 |
Carrying Amounts and Fair Values of Financial Instruments | The following presents the carrying amounts and the fair values of our financial instruments as of September 30, 2021 and December 31, 2020 (in thousands):
|  | September 30, 2021 |  |  | December 31, 2020 |
|  | Carrying Value |  |  | Fair Value |  |  | Carrying Value |  |  | Fair Value |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Commodity swaps, collars and basis swaps |  | $ | 3,443 |  |  | $ | 3,443 |  |  | $ | 24,052 |  |  | $ | 24,052 |
Divestiture contingent consideration |  |  | 50,220 |  |  |  | 50,220 |  |  |  | 15,960 |  |  |  | 15,960 |
Marketable securities (a) |  |  | 66,833 |  |  |  | 66,833 |  |  |  | 63,942 |  |  |  | 63,942 |
(Liabilities): |  |  |  |  |  |  |  |  |  |  |  |
Commodity swaps, collars and basis swaps |  |  | (770,721 | ) |  |  | (770,721 | ) |  |  | (36,453 | ) |  |  | (36,453 | )
Bank credit facility (b) |  |  | (30,000 | ) |  |  | (30,000 | ) |  |  | (702,000 | ) |  |  | (702,000 | )
5.75% senior notes due 2021 (b) |  |  | — |  |  |  | — |  |  |  | (25,496 | ) |  |  | (25,474 | )
5.00% senior notes due 2022 (b) |  |  | (169,589 | ) |  |  | (172,667 | ) |  |  | (169,589 | ) |  |  | (170,128 | )
5.875% senior notes due 2022 (b) |  |  | (48,528 | ) |  |  | (49,383 | ) |  |  | (48,528 | ) |  |  | (48,471 | )
Other senior notes due 2022 (b) |  |  | — |  |  |  | — |  |  |  | (490 | ) |  |  | (490 | )
5.00% senior notes due 2023 (b) |  |  | (532,335 | ) |  |  | (552,463 | ) |  |  | (532,335 | ) |  |  | (521,699 | )
4.875% senior notes due 2025 (b) |  |  | (750,000 | ) |  |  | (791,715 | ) |  |  | (750,000 | ) |  |  | (707,918 | )
9.25% senior notes due 2026 (b) |  |  | (850,000 | ) |  |  | (926,832 | ) |  |  | (850,000 | ) |  |  | (888,208 | )
8.25% senior notes due 2029 (b) |  |  | (600,000 | ) |  |  | (674,994 | ) |  |  | — |  |  |  | — |
5.75% senior subordinated notes due 2021 (b) |  |  | — |  |  |  | — |  |  |  | (19,896 | ) |  |  | (19,589 | )
5.00% senior subordinated notes due 2022 (b) |  |  | — |  |  |  | — |  |  |  | (9,730 | ) |  |  | (9,247 | )
5.00% senior subordinated notes due 2023 (b) |  |  | — |  |  |  | — |  |  |  | (7,712 | ) |  |  | (6,604 | )
Deferred compensation plan (c) |  |  | (184,882 | ) |  |  | (184,882 | ) |  |  | (96,563 | ) |  |  | (96,563 | )

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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