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v3.19.3.a.u2

Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Significant Accounting Policies [Line Items] |  |  |
Capitalized costs | $ 161,553,000 | $ 195,139,000 | $ 294,345,000
Maximum reserves sold from cost center not expected to result in significant alteration (less than) | 25.00% |  |
Interest capitalized during period | $ 1,500,000 | 0 | 0
Natural gas balancing liability | 1,600,000 | 1,700,000 |
Internal Costs |  |  |
Significant Accounting Policies [Line Items] |  |  |
Capitalized costs | $ 5,700,000 | $ 8,800,000 | $ 14,800,000
Minimum | Buildings and structures |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life | 7 years |  |
Minimum | Equipment |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life | 1 year |  |
Maximum | Buildings and structures |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life | 39 years |  |
Maximum | Equipment |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life | 27 years |  |

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- Definition Amount of costs incurred related to oil and gas property acquisition, exploration and development activities, including capitalized costs and costs charged to expense. + References No definition available. + Details
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- Definition Amount of interest capitalized during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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