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v3.19.3.a.u2

Significant Accounting Policies (Details) a in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 03, 2018 USD ($) | May 31, 2018 USD ($) | Dec. 31, 2019 USD ($) a well | Jun. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) a well | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Producing Oil Wells | well |  |  | 151,000 |  | 151,000 |  |
Impairment of proved and unproved properties |  |  | $ 327,400,000 | $ 18,650,000 | $ 327,400,000 | $ 0 | $ 137,865,000
Impairment of Unproved Properties and Expirations |  |  |  |  | 119,429,000 | 0 | 0
Goodwill impairment test, measurement period |  |  | 5 years |  |  |  |
Impairment of intangible assets |  |  |  |  | $ 0 | $ 18,650,000 | $ 0
Company's matching contribution, percentage |  |  |  |  | 6.00% | 6.00% | 6.00%
Discretionary contributions to the Plan, amount |  |  |  |  |  | $ 0 | $ 0
Total payment and cost to the Plan |  |  |  |  | $ 3,460,000 | 3,205,000 | 2,866,000
Minimum |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Discretionary contributions to the Plan, percentage |  |  |  |  | 1.00% |  |
Maximum |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Discretionary contributions to the Plan, percentage |  |  |  |  | 6.00% |  |
Proved Properties |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Impairment of proved and unproved properties |  |  |  |  |  | 0 | 0
Unproved Properties |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Impairment of proved and unproved properties |  |  |  |  |  |  | 0
Building and Improvements | Minimum |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  |  | 10 years |  |
Building and Improvements | Maximum |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  |  | 45 years |  |
Machinery and Equipment | Minimum |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  |  | 3 years |  |
Machinery and Equipment | Maximum |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  |  | 25 years |  |
Gathering and Transmission | Minimum |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  |  | 30 years |  |
Gathering and Transmission | Maximum |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  |  | 40 years |  |
Knox and Coalfield |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  | 137,865,000
Exploration and Production Related Other Costs |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Exploration expense |  |  |  |  | $ 44,380,000 | 12,033,000 | $ 48,074,000
Midstream |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Goodwill acquired during period | $ 796,359,000 |  |  |  |  |  |
Other intangible assets | $ 128,781,000 |  |  |  |  |  |
Customer Relationships |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Useful life, customer relationship intangible assets |  |  |  |  | 17 years |  |
Customer Relationships | Midstream |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Impairment of intangible assets |  | $ 18,650,000 |  |  |  | $ 18,650,000 |
Useful life, customer relationship intangible assets |  | 17 years |  |  |  |  |
Marcellus Shale | Central Pennsylvania |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Producing Oil Wells | well |  |  | 56 |  | 56 |  |
Net acres of land | a |  |  | 51 |  | 51 |  |
Impairment of proved and unproved properties |  |  |  |  | $ 327,400,000 |  |
Midstream | Operating Segments | Maximum |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Percentage of fair value in excess of carrying amount (less than) |  |  | 10.00% |  | 10.00% |  |

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