Supplemental Gas Data (unaudited) - Capitalized Costs (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Extractive Industries [Abstract]
Intangible Drilling Cost	$ 5,247,800	$ 4,965,252
Gas Gathering Assets	2,483,561	2,510,916
Proved Gas Properties	1,312,706	1,253,094
Unproved Gas Properties	730,400	725,705
Gas Wells and Related Equipment	1,202,731	1,120,061
Other Gas Assets	96,279	95,734
Total Property, Plant and Equipment	11,073,477	10,670,762
Accumulated Depreciation, Depletion and Amortization	(4,279,070)	(3,852,593)
Net Capitalized Costs	$ 6,794,407	$ 6,818,169

Capitalized Costs, Other Gas Assets

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Drilling Cost

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Amount of accumulated depreciation, depletion, amortization and valuation allowance relating to oil and gas producing activities.

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The sum of capitalized costs relating to oil and gas producing activities before accounting for accumulated depreciation.

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Net amount of capitalized costs relating to oil and gas producing activities.

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Capitalized costs incurred for support equipment and facilities used in oil and gas producing activities (such as seismic equipment, drilling equipment, construction and grading equipment, vehicles, repair shops, warehouses, supply points, camps, and division, district, or field offices).

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Capitalized costs which include those incurred to (1) to drill and equip those exploratory wells and exploratory-type stratigraphic test wells that have found proved reserves and (2) obtain access to proved reserves and provide facilities for extracting, treating, gathering, storing the oil and gas, including the drilling and equipping of development wells and development-type stratigraphic wells and service wells.

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Oil and Gas properties with proved reserves under the successful effort method.

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Oil and Gas properties with unproved reserves under the successful effort method.

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