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Property, Plant and Equipment - Assets Amortized by Units of Production (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Unproved Gas Properties	$ 725,705	$ 755,590
Total	10,963,996	10,572,006
Assets amortized by units of production
Property, Plant and Equipment [Line Items]
Unproved Gas Properties	725,705	755,590
Advance Royalties	9,676	12,770
Total	$ 735,381	$ 768,360

X

- Definition

Discloses the period end balance sheet amount of advances for gas exploration, development and production.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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- Definition

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

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