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Summary of Significant Accounting Policies - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) Customer Institution Segment | Dec. 31, 2017 USD ($) Customer | Dec. 31, 2016 USD ($) Customer | Jan. 01, 2019 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Number of operating segments | Segment | 1 |  |  |
Cumulative effect of adoption of ASU 2018-02 reclassified to retained earnings | $ 446,000 |  |  |
Unsatisfied performance obligations | $ 10,100,000,000 |  |  |
Number of financial institutions | Institution | 1 |  |  |
Amortization of unproved properties included in depreciation, depletion, and amortization | $ 82,300,000 | $ 52,800,000 | $ 25,000,000 |
Assets legally restricted for purposes of settling asset retirement obligations | 0 |  |  |
Receivables from contracts with customers | 363,000,000 | 215,500,000 |  |
Concentration Risk [Line Items] |  |  |  |
Cumulative effect of adoption of ASU 2018-02 reclassified to retained earnings | $ 446,000 | $ 0 | $ 0 |
Minimum |  |  |  |
Properties and Equipment |  |  |  |
Unsatisfied performance obligations, expected period of satisfaction | 5 years |  |  |
Maximum |  |  |  |
Properties and Equipment |  |  |  |
Unsatisfied performance obligations, expected period of satisfaction | 20 years |  |  |
Gathering and pipeline systems and equipment | Minimum |  |  |  |
Properties and Equipment |  |  |  |
Estimated useful life | 10 years |  |  |
Gathering and pipeline systems and equipment | Maximum |  |  |  |
Properties and Equipment |  |  |  |
Estimated useful life | 25 years |  |  |
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 | 10 years |  |  |
Sales Revenue, Net | Customer |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Number of customers | Customer | 3 | 2 | 2 |
Forecast | Minimum | ASU 2016-02 |  |  |  |
Properties and Equipment |  |  |  |
Operating lease liability |  |  |  | $ 40,000,000
Operating lease, right of use asset |  |  |  | 40,000,000
Forecast | Maximum | ASU 2016-02 |  |  |  |
Properties and Equipment |  |  |  |
Operating lease liability |  |  |  | 60,000,000
Operating lease, right of use asset |  |  |  | $ 60,000,000
Customer one | Sales Revenue, Net | Customer |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of total sales | 20.00% | 18.00% | 19.00% |
Customer two | Sales Revenue, Net | Customer |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of total sales | 11.00% | 11.00% | 10.00% |
Customer three | Sales Revenue, Net | Customer |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of total sales | 9.00% |  |  |

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