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Property, Plant and Equipment Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Capital Leased Assets [Line Items]
Interest costs capitalized	$ 5,482	$ 1,075
Finance lease right-of-use assets, gross	72,916
Capital leased assets, gross		73,144
Accumulated amortization for finance lease right of use asset	63,008
Accumulated amortization for capital leases		59,517
Jewell Ridge Pipeline
Capital Leased Assets [Line Items]
Finance lease right-of-use assets, gross	66,919
Capital leased assets, gross		66,919
Vehicles
Capital Leased Assets [Line Items]
Finance lease right-of-use assets, gross	$ 5,997
Capital leased assets, gross		$ 6,225

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- Definition

Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

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-Publisher FASB
-Name Accounting Standards Codification
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The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

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