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Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 245,515	$ 220,280
Less allowances for depreciation, depletion and amortization	107,454	95,726
Property, plant and equipment, net		124,554
Depreciation, depletion and amortization	13,600	11,600
Coal lands and real estate
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	54,647	56,716
Plant and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 190,868	$ 163,564

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Depreciation, Depletion and Amortization, Production

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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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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