Revenue (Tables)

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

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:



	Year Ended December 31, 2019
	Met		Thermal		Total
Export coal revenues	$	1,196,816	$	50,798	$	1,247,614
Domestic coal revenues	551,806		482,587		1,034,393
Total coal revenues	$	1,748,622	$	533,385	$	2,282,007



	Year Ended December 31, 2018
	Met			Thermal		Total
Export coal revenues	$	1,620,277		$	51,369	$	1,671,646
Domestic coal revenues	105,587		—	243,656		349,243
Total coal revenues	$	1,725,864		$	295,025	$	2,020,889



	Year Ended December 31, 2017 ⁽¹⁾
	Met		Thermal		Total
Export coal revenues	$	1,253,834	$	11,486	$	1,265,320
Domestic coal revenues	91,170		283,393		374,563
Total coal revenues	$	1,345,004	$	294,879	$	1,639,883

⁽¹⁾ Includes freight and handling revenues.

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction

The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied as of December 31, 2019.



	2020		2021		2022		2023		2024		Total
Estimated coal revenues ⁽¹⁾	$	391,469	$	264,690	$	190,644	$	130,268	$	46,000	$	1,023,071

⁽¹⁾ Amounts only include estimated coal revenues associated with contracts with customers with fixed pricing with original expected duration of more than one year. The Company has elected not to disclose the aggregate amount of the transaction price allocated to the performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period for performance obligations with either of the following conditions: 1) the remaining performance obligation is part of a contract that has an original expected duration of one year or less; or 2) the remaining performance obligation has variable consideration that is allocated entirely to a wholly unsatisfied performance obligation.