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Assets and Liabilities Measured at Fair Value - Narratives (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) OffsettingPosition | Dec. 31, 2018 USD ($) | [1],[2] | Dec. 31, 2017 USD ($) | [1],[2]
Expected life | 3 years |  |
Number of offsetting positions | OffsettingPosition | 0 |  |
Impairment of assets | $ | $ 0 | $ 20,000,000 | $ 0
Contingent consideration |  |  |
Expected life | 6 years |  |
Fair value, expected volatility rate | 30.00% |  |
Risk-free interest rate | 1.66% |  |
[1] | 1 Reclassified to conform with current presentation (see Notes C and E). 2017 revenue is presented net of $58.9 million of transportation, gathering and processing costs as historically shown prior to the adoption of ASC 606 on January 1, 2018. See Notes to Consolidated Financial Statements, page 58.
[2] | Reclassified to conform with current presentation (see Note E)

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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66906256&loc=d3e66150-109466 + Details
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