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Derivatives Hedges and Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2020
Derivative Instruments And Hedging Activities Disclosure [Abstract] |
Liabilities Measured at Fair Value on Recurring Basis | The following details our assets and liabilities that are measured at fair value on a recurring basis at September 30, 2020 and December 31, 2019
|  |  |  |  |  | Fair Value Measurements at September 30, 2020 Using |  |  |  |  |
Description |  | Total Fair Value at September 30, 2020 |  |  | Quoted Prices in Active Markets for Identical Contracts (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3)(1) |  |  | Total Fair Value at December 31, 2019 |
|  | (In Thousands) |
Assets - Supplies, prepaid items and other: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 623 |  |  | $ | — |  |  | $ | 623 |  |  | $ | — |  |  | $ | — |
Total |  | $ | 623 |  |  | $ | — |  |  | $ | 623 |  |  | $ | — |  |  | $ | — |
Liabilities - Current and noncurrent accrued and other liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded derivative |  | $ | 468 |  |  | $ | — |  |  | $ | — |  |  | $ | 468 |  |  | $ | 1,084 |
Total |  | $ | 468 |  |  | $ | — |  |  | $ | — |  |  | $ | 468 |  |  | $ | 1,084 |
| (1) | There was no Level 3 transfer activity for the nine months ended September 30, 2020.
Summary of Financial Instruments with Fair Values Significantly Different from Carrying Amounts Except for Senior Secured Notes | At September 30, 2020 and December 31, 2019, we did not have any financial instruments with fair values significantly different from their carrying amounts (which excludes issuance costs, if applicable), except for the Senior Secured Notes as shown below.
|  | September 30, 2020 |  |  | December 31, 2019 |
|  | Carrying |  |  | Estimated |  |  | Carrying |  |  | Estimated |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
|  | (In Millions) |
Senior Secured Notes (1) |  | $ | 435 |  |  | $ | 426 |  |  | $ | 435 |  |  | $ | 449 |
(1)Based on a quoted price of 98.0 at September 30, 2020 and 103.25 at December 31, 2019.

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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 liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + 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 (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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