Revenue

3 Months Ended

Mar. 31, 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 March 31, 2020
	Met		Thermal		Total
Export coal revenues	$	249,355	$	7,383	$	256,738
Domestic coal revenues	114,688		96,941		211,629
Total coal revenues	$	364,043	$	104,324	$	468,367

	Three Months Ended March 31, 2019
	Met		Thermal		Total
Export coal revenues	$	334,185	$	9,121	$	343,306
Domestic coal revenues	136,258		127,396		263,654
Total coal revenues	$	470,443	$	136,517	$	606,960

Performance Obligations

The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied as of March 31, 2020.

	Remainder of 2020		2021		2022		2023		2024		2025		Total
Estimated coal revenues	$	324,629	$	264,690	$	190,644	$	130,268	$	46,000	$	—	$	956,231