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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2020
Fair Value Disclosures [Abstract] |
Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value | We use a market approach for our recurring fair value measurements and endeavor to use the best information available. The following tables present the fair value hierarchy table for assets and liabilities measured at fair value, on a recurring basis (in thousands):
| Fair Value Measurements at June 30, 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 June 30, 2020 |  |
Trading securities held in the deferred compensation plans | $ | 54,637 |  |  | $ | — |  |  | $ | — |  |  | $ | 54,637 |
Commodity price derivatives –swaps |  | — |  |  |  | 161,636 |  |  |  | — |  |  |  | 161,636 |
–collars |  | — |  |  |  | 2,557 |  |  |  | — |  |  |  | 2,557 |
–three-way collars |  | — |  |  |  | (18,545 | ) |  |  | — |  |  |  | (18,545 | )
–calls |  | — |  |  |  | (44 | ) |  |  | (62 | ) |  |  | (106 | )
–basis swaps |  | — |  |  |  | (3,456 | ) |  |  | — |  |  |  | (3,456 | )
–swaptions |  | — |  |  |  | — |  |  |  | (6,201 | ) |  |  | (6,201 | )
Derivatives–freight swaps |  | — |  |  |  | (4,956 | ) |  |  | — |  |  |  | (4,956 | )
| Fair Value Measurements at December 31, 2019 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, 2019 |
Trading securities held in the deferred compensation plans | $ | 62,009 |  |  | $ | — |  |  | $ | — |  |  | $ | 62,009 |
Commodity price derivatives –swaps |  | — |  |  |  | 131,886 |  |  |  | — |  |  |  | 131,886 |
–calls |  | — |  |  |  | (349 | ) |  |  | — |  |  |  | (349 | )
–basis swaps |  | — |  |  |  | (4,732 | ) |  |  | — |  |  |  | (4,732 | )
–swaptions |  | — |  |  |  | — |  |  |  | (4,848 | ) |  |  | (4,848 | )
Derivatives–freight swaps |  | — |  |  |  | 1,529 |  |  |  | — |  |  |  | 1,529 |
Reconciliation of the Beginning and Ending Balances for Derivative Instruments Classified as Level 3 in the Fair Value Hierarchy | The following is a reconciliation of the beginning and ending balances for derivative instruments classified as Level 3 in the fair value hierarchy (in thousands):
|  | As of June 30, 2020 |
Balance at December 31, 2019 |  | $ | (4,848 | )
Total losses: |  |  |  |
Included in earnings |  |  | (1,600 | )
Settlements, net |  |  | 185 |
Balance at June 30, 2020 |  | $ | (6,263 | )
Value of Assets Measured at Fair Value on Nonrecurring Basis | The following table presents the value of these assets measured at fair value on a nonrecurring basis at the time impairment was recorded (in thousands):
|  | Year Ended December 31, 2019 |  |
|  | Fair Value |  |  |  | Impairment |  |
North Louisiana |  | $ 370,500 |  |  |  | $ 1,093,531 |  |
Carrying Amounts and Fair Values of Financial Instruments | The following presents the carrying amounts and the fair values of our financial instruments as of June 30, 2020 and December 31, 2019 (in thousands):
|  | June 30, 2020 |  |  | December 31, 2019 |
|  | Carrying Value |  |  | Fair Value |  |  | Carrying Value |  |  | Fair Value |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity swaps, options and basis swaps |  | $ | 146,236 |  |  | $ | 146,236 |  |  | $ | 137,554 |  |  | $ | 137,554 |
Marketable securities (a) |  |  | 54,637 |  |  |  | 54,637 |  |  |  | 62,009 |  |  |  | 62,009 |
(Liabilities): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity swaps, options and basis swaps |  |  | (15,307 | ) |  |  | (15,307 | ) |  |  | (14,068 | ) |  |  | (14,068 | )
Bank credit facility (b) |  |  | (639,000 | ) |  |  | (639,000 | ) |  |  | (477,000 | ) |  |  | (477,000 | )
5.75% senior notes due 2021 (b) |  |  | (37,570 | ) |  |  | (36,307 | ) |  |  | (374,139 | ) |  |  | (375,909 | )
5.00% senior notes due 2022 (b) |  |  | (461,625 | ) |  |  | (420,430 | ) |  |  | (511,886 | ) |  |  | (501,582 | )
5.875% senior notes due 2022 (b) |  |  | (113,649 | ) |  |  | (105,084 | ) |  |  | (297,617 | ) |  |  | (294,757 | )
Other senior notes due 2022 (b) |  |  | (490 | ) |  |  | (478 | ) |  |  | (590 | ) |  |  | (592 | )
5.00% senior notes due 2023 (b) |  |  | (654,672 | ) |  |  | (558,383 | ) |  |  | (741,531 | ) |  |  | (683,291 | )
4.875% senior notes due 2025 (b) |  |  | (750,000 | ) |  |  | (566,040 | ) |  |  | (750,000 | ) |  |  | (645,098 | )
9.25% senior notes due 2026 (b) |  |  | (550,000 | ) |  |  | (495,143 | ) |  |  | — |  |  |  | — |
5.75% senior subordinated notes due 2021 (b) |  |  | (21,865 | ) |  |  | (19,687 | ) |  |  | (22,214 | ) |  |  | (21,539 | )
5.00% senior subordinated notes due 2022 (b) |  |  | (19,054 | ) |  |  | (15,493 | ) |  |  | (19,054 | ) |  |  | (17,011 | )
5.00% senior subordinated notes due 2023 (b) |  |  | (7,712 | ) |  |  | (6,327 | ) |  |  | (7,712 | ) |  |  | (7,654 | )
Deferred compensation plan (c) |  |  | (73,630 | ) |  |  | (73,630 | ) |  |  | (74,472 | ) |  |  | (74,472 | )
(a) | Marketable securities, which are held in our deferred compensation plans, are actively traded on major exchanges.
(b) | The book value of our bank debt approximates fair value because of its floating rate structure. The fair value of our senior notes and our senior subordinated notes is based on end of period market quotes which are Level 2 inputs.
(c) | The fair value of our deferred compensation plan is updated at the closing price on the balance sheet date which is a Level 1 input.

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 3: 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 the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 + 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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