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Equity Method Investments - Narrative (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 10, 2020 | Nov. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Feb. 28, 2014 | Apr. 30, 2012
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Well costs |  |  | $ 0 | $ 0 | $ 0 | $ 19,511 |  |
Payments for sale of equity method investments |  |  | 9,424 |  |  |  |  |
Net proceeds from sale of investment |  |  |  | 249,463 | $ 0 |  |  |
Restricted cash |  |  | $ 11,578 | 13,556 |  |  |  |
Transcontinental Gas Pipe Line Company LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Entity's equity interest in construction agreement (as a percent) |  |  |  |  |  |  | 61.00% |
Meade Pipeline Co LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Entity's equity interest in construction agreement (as a percent) |  |  |  |  |  |  | 39.00% |
Constitution Pipeline Company, LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership interest | 25.00% |  |  |  |  |  |  | 25.00%
Payable for disposal of equity method investment |  |  |  | $ 9,400 |  |  |  |
Payments for sale of equity method investments | $ 9,400 |  |  |  |  |  |  |
Meade Pipeline Co LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  | 20.00% |
Net proceeds from sale of investment |  | $ 249,500 |  |  |  |  |  |
Gain on sale of investment |  | $ 75,800 |  |  |  |  |  |

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- Definition The amount of capitalized exploratory well costs that is pending the determination of proved reserves. This does not include amounts that were capitalized and subsequently expensed in the same annual period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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