Supplemental Disclosures About Natural Gas Producing Activities - Additional Information (Details) - Bcf |
12 Months Ended | |
|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
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| Extractive Industries [Abstract] | ||
| Acquired reserves (in Bcfe) | 327 | |
| Extensions, discoveries and other additions (in Bcfe) | 22 | |
| Additional proved undeveloped locations, detailed analysis (in Bcfe) | 19 | |
| Additional proved undeveloped locations, drilling activities (in Bcfe) | 3 | |
| Negative revisions (in Bcfe) | 85 | |
| Negative revisions, previous estimates (in Bcfe) | 59 | |
| Negative revisions, revision of previous estimates (in Bcfe) | 14 | |
| Negative revisions, due to loss of leases (in Bcfe) | 12 | |
| Positive revisions, increase in commodity prices (in Bcfe) | 1 | |
| Acquisition of proved reserves through minor interest acquired (in Bcfe) | 1 | |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Purchase of minerals in place. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Proved Developed and Undeveloped Reserves, Decrease due to Loss of Leases No definition available.
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| X | ||||||||||
- Definition Proved Developed and Undeveloped Reserves, Period Decrease No definition available.
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| X | ||||||||||
- Definition Proved Developed and Undeveloped Reserves, Revisions due to Increase in Commodity Price No definition available.
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| X | ||||||||||
- Definition Proved Undeveloped Reserves, Decrease due to Revisions of Previous Estimates No definition available.
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| X | ||||||||||
- Definition Proved Undeveloped Reserves, Discoveries No definition available.
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| X | ||||||||||
- Definition Proved Undeveloped Reserves, Extensions No definition available.
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| X | ||||||||||
- Definition Proved Undeveloped Reserves, Revisions of Previous Estimates No definition available.
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| X | ||||||||||
- Definition Reserve Quantity Attributable to Minority Interest Acquisition, Volume No definition available.
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