Revenue

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

Revenue

Revenue

Disaggregation of Revenue from Contracts with Customers

The following tables disaggregate the Company’s coal revenues by product category and by market to depict how the nature, amount, timing, and uncertainty of the Company’s coal revenues and cash flows are affected by economic factors:

	Three Months Ended June 30, 2020
	Met		Thermal		Total
Export coal revenues	$	241,905	$	10,369	$	252,274
Domestic coal revenues	82,903		75,437		158,340
Total coal revenues	$	324,808	$	85,806	$	410,614

	Three Months Ended June 30, 2019
	Met		Thermal		Total
Export coal revenues	$	345,576	$	17,262	$	362,838
Domestic coal revenues	156,053		134,937		290,990
Total coal revenues	$	501,629	$	152,199	$	653,828

	Six Months Ended June 30, 2020
	Met		Thermal		Total
Export coal revenues	$	491,260	$	17,752	$	509,012
Domestic coal revenues	197,591		172,378		369,969
Total coal revenues	$	688,851	$	190,130	$	878,981

	Six Months Ended June 30, 2019
	Met		Thermal		Total
Export coal revenues	$	679,762	$	26,382	$	706,144
Domestic coal revenues	292,311		262,333		554,644
Total coal revenues	$	972,073	$	288,715	$	1,260,788

Performance Obligations

The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied as of June 30, 2020.

	Remainder of 2020		2021		2022		2023		2024		2025		Total
Estimated coal revenues	$	223,350	$	259,065	$	191,278	$	—	$	—	$	—	$	673,693