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Supplemental Gas Data (unaudited) Capitalized Exploratary Well Cost Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Extractive Industries [Abstract]
Costs reclassified to wells, equipment and facilities based on the determination of proved reserves	$ 59,981	$ 46,614	$ 40,149
Costs expensed due to determination of dry hole or abandonment of project	$ 0	$ 809	$ 0

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No definition available.

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The adjustment to expense previously capitalized costs of drilling exploratory wells when proved reserves are not found or when the entity obtains information that raises substantial doubt about the economic or operational viability of the project.

+ References

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Previously capitalized costs of the drilling of wells that were reclassified as part of the costs of the enterprise's wells and related equipment and facilities at the time that proved reserves were found.

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