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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | $ 224,288 | $ 216,338
Realized gain on derivatives | 10,867 | 3,270
Unrealized gain (loss) on derivatives | 136,430 | (45,719)
Total revenue | 371,585 | 173,889
Oil revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 169,585 | 154,204
Natural gas revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 28,329 | 39,065
Third-party midstream services revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 15,830 | 11,838
Sales of purchased natural gas |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 10,544 | 11,231
Total revenues from contracts with customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | $ 224,288 | $ 216,338

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