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Summary of Significant Accounting Policies - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) Customer Institution Segment | Dec. 31, 2016 USD ($) Customer | Dec. 31, 2015 USD ($) Customer | Jan. 01, 2017 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Number of operating segments | Segment | 1 |  |  |
Number of financial institutions | Institution | 4 |  |  |
Amortization of unproved properties included in depreciation, depletion, and amortization | $ 52,800,000 | $ 25,000,000 | $ 41,400,000 |
Assets legally restricted for purposes of settling asset retirement obligations | 0 |  |  |
Properties and Equipment |  |  |  |
Net Cash Provided by Operating Activities | 898,160,000 | 397,441,000 | 749,598,000 |
Net cash provided by financing activities | $ 210,502,000 | $ (453,805,000) | $ (223,296,000) |
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 | 2 | 2 | 2 |
Customer one | Sales Revenue, Net | Customer |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of total sales | 18.00% | 19.00% | 16.00% |
Customer two | Sales Revenue, Net | Customer |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of total sales | 11.00% | 10.00% | 14.00% |
Accounting Standards Update 2016-09, Excess Tax Benefit Component |  |  |  |
Properties and Equipment |  |  |  |
Cumulative effect adjustment |  |  |  | $ 42,200,000
Accounting Standards Update 2017-07 |  |  |  |
Properties and Equipment |  |  |  |
Other expense (income) |  | $ 1,600,000 | $ 1,400,000 |

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