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Property, Plant and Equipment Assets Amortized by Units of Production (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Unproved Gas Properties	$ 755,590	$ 927,667
Total	10,572,006	9,567,428
Assets amortized by units of production
Property, Plant and Equipment [Line Items]
Unproved Gas Properties	755,590	927,667
Advance Royalties	12,770	12,863
Total	$ 768,360	$ 940,530

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

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