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Summary of Significant Accounting Policies - Narrative (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) Institution Segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Properties and Equipment |  |  |
Number of operating segments | Segment | 1 |  |
Number of financial institutions | Institution | 1 |  |
Restricted cash | $ 11,578,000 | $ 13,556,000 |
Amortization of unproved properties included in depreciation, depletion and amortization | 8,200,000 | 32,600,000 | $ 82,300,000
Assets legally restricted for purposes of settling asset retirement obligations | 0 | 0 |
Finance leases | 0 | 0 |
Accounts Payable |  |  |
Properties and Equipment |  |  |
Book overdraft | $ 0 | $ 0 |
Buildings | Minimum |  |  |
Properties and Equipment |  |  |
Estimated useful life | 25 years |  |
Buildings | Maximum |  |  |
Properties and Equipment |  |  |
Estimated useful life | 40 years |  |
Other Assets | Minimum |  |  |
Properties and Equipment |  |  |
Estimated useful life | 3 years |  |
Other Assets | Maximum |  |  |
Properties and Equipment |  |  |
Estimated useful life | 25 years |  |
Customer One | Sales Revenue, Net | Customer |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of Total Sales | 21.00% | 17.00% | 20.00%
Customer Two | Sales Revenue, Net | Customer |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of Total Sales | 16.00% | 16.00% | 11.00%
Customer Three | Sales Revenue, Net | Customer |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of Total Sales | 12.00% |  |

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