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Pay vs Performance Disclosure - USD ($)

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

Dec. 31, 2020

Pay vs Performance Disclosure

Pay vs Performance Disclosure, Table

																					Value of Initial Fixed $100 Investment Based On:4
Year			Summary Compensation Table Total for Glenn L. Kellow 1 ($)			Compensation Actually Paid to Glenn L. Kellow 1,2,3 ($)			Summary Compensation Table Total for James C. Grech 1 ($)			Compensation Actually Paid to James C. Grech 1,2,3 ($)			Average Summary Compensation Table Total for Non-PEO NEOs1 ($)			Average Compensation Actually Paid to Non-PEO NEOs1,2,3 ($)			TSR ($)			Peer Group TSR ($)			Net Income ($)			Adjusted EBITDA5 ($)
(a)			(b)			(c)			(b)			(c)			(d)			(e)			(f)			(g)			(h)			(i)
2023			0			0			5,879,892			4,805,574			2,630,479			2,504,778			269.27			218.23			759,600,000			1,363,900,000
2022			0			0			3,811,296			8,016,084			2,172,769			4,353,640			289.69			178.99			1,319,100,000			1,844,700,000
2021			8,753,812			11,945,403			4,239,272			4,777,733			2,195,035			3,284,553			110.42			157.75			371,400,000			916,700,000
2020			6,352,911			(795,179)			0			0			1,751,662			719,821			26.43			116.44			(1,873,800,000)			258,800,000

Company Selected Measure Name

Adjusted EBITDA

Named Executive Officers, Footnote

(1)Glenn L. Kellow was our PEO from May 2015 to June 2021. James C. Grech was our PEO from June 2021 to present. The individuals comprising the Non-PEO NEOs for each year presented are listed below.

2020			2021			2022			2023
Mark A. Spurbeck			Mark A. Spurbeck			Mark A. Spurbeck			Mark A. Spurbeck
Darren R. Yeates			Darren R. Yeates			Darren R. Yeates			Darren R. Yeates
Marc E. Hathhorn			Marc E. Hathhorn			Marc E. Hathhorn			Marc E. Hathhorn
Kemal Williamson			Scott T. Jarboe			Scott T. Jarboe			Scott T. Jarboe
Amy B. Schwetz			Kemal Williamson
Charles F. Meintjes

Peer Group Issuers, Footnote

The Peer Group TSR set forth in this table utilizes the S&P Metals and Mining Select Industry Index, which we also utilize in the stock performance graph required by Item 201(e) of Regulation S-K included in our Annual Report for the year ended December 31, 2023. The comparison assumes $100 was invested for the period starting December 31, 2019, through the end of the listed year in the Company and in the S&P Metals and Mining Select Industry Index, respectively. Historical stock performance is not necessarily indicative of future stock performance. For 2023 we have changed this comparator group to better align with our 10-K Performance Graph. Prior to 2023, we utilized the Custom Composite Index (a peer group comprised of Arch Resources, Inc., Hallador Energy Co., and Warrior Met Coal, Inc.), which reflects publicly listed U.S. companies within the coal industry of similar size or product type. TSR performance for the Custom Composite Index, for the years ending 12/31/2020, 12/31/2021, 12/31/2022, and 12/31/2023, would have been: $80.70, $125.14, $211.70, and $308.20, respectively.

Adjustment To PEO Compensation, Footnote

Compensation Actually Paid reflects the exclusions and inclusions of certain amounts for the PEOs and the Non-PEO NEOs as set forth below. Equity values are calculated in accordance with FASB ASC Topic 718. Amounts in the Exclusion of Stock Awards column are the totals from the Stock Awards column set forth in the Summary Compensation Table.

Year			Summary Compensation Table Total for James C. Grech ($)			Exclusion of Stock Awards for James C. Grech ($)			Inclusion of Equity Values for James C. Grech ($)			Compensation Actually Paid to James C. Grech ($)
2023			5,879,892			(1,999,968)			925,650			4,805,574

Year			Average Summary Compensation Table Total for Non-PEO NEOs ($)			Average Exclusion of Stock Awards for Non-PEO NEOs ($)			Average Inclusion of Equity Values for Non-PEO NEOs ($)			Average Compensation Actually Paid to Non-PEO NEOs ($)
2023			2,630,479			(697,479)			571,778			2,504,778

The amounts in the Inclusion of Equity Values in the tables above are derived from the amounts set forth in the following tables:

Year			Year-End Fair Value of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year for James C. Grech ($)			Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for James C. Grech ($)			Vesting-Date Fair Value of Equity Awards Granted During Year that Vested During Year for James C. Grech ($)			Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for James C. Grech ($)			Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year for James C. Grech ($)			Total - Inclusion of Equity Values for James C. Grech ($)
2023			1,697,684			(186,012)			0			(586,022)			0			925,650

Year			Average Year-End Fair Value of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year for Non-PEO NEOs ($)			Average Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for Non-PEO NEOs ($)			Average Vesting-Date Fair Value of Equity Awards Granted During Year that Vested During Year for Non-PEO NEOs ($)			Average Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for Non-PEO NEOs ($)			Average Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year for Non-PEO NEOs ($)			Average Total - Inclusion of Equity Values for Non-PEO NEOs ($)
2023			592,059			(22,221)			0			1,940			0			571,778

Non-PEO NEO Average Total Compensation Amount

$ 2,630,479

$ 2,172,769

$ 2,195,035

$ 1,751,662

Non-PEO NEO Average Compensation Actually Paid Amount

$ 2,504,778

4,353,640

3,284,553

719,821

Adjustment to Non-PEO NEO Compensation Footnote

Compensation Actually Paid reflects the exclusions and inclusions of certain amounts for the PEOs and the Non-PEO NEOs as set forth below. Equity values are calculated in accordance with FASB ASC Topic 718. Amounts in the Exclusion of Stock Awards column are the totals from the Stock Awards column set forth in the Summary Compensation Table.

Year			Summary Compensation Table Total for James C. Grech ($)			Exclusion of Stock Awards for James C. Grech ($)			Inclusion of Equity Values for James C. Grech ($)			Compensation Actually Paid to James C. Grech ($)
2023			5,879,892			(1,999,968)			925,650			4,805,574

Year			Average Summary Compensation Table Total for Non-PEO NEOs ($)			Average Exclusion of Stock Awards for Non-PEO NEOs ($)			Average Inclusion of Equity Values for Non-PEO NEOs ($)			Average Compensation Actually Paid to Non-PEO NEOs ($)
2023			2,630,479			(697,479)			571,778			2,504,778

The amounts in the Inclusion of Equity Values in the tables above are derived from the amounts set forth in the following tables:

Year			Year-End Fair Value of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year for James C. Grech ($)			Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for James C. Grech ($)			Vesting-Date Fair Value of Equity Awards Granted During Year that Vested During Year for James C. Grech ($)			Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for James C. Grech ($)			Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year for James C. Grech ($)			Total - Inclusion of Equity Values for James C. Grech ($)
2023			1,697,684			(186,012)			0			(586,022)			0			925,650

Year			Average Year-End Fair Value of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year for Non-PEO NEOs ($)			Average Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for Non-PEO NEOs ($)			Average Vesting-Date Fair Value of Equity Awards Granted During Year that Vested During Year for Non-PEO NEOs ($)			Average Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for Non-PEO NEOs ($)			Average Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year for Non-PEO NEOs ($)			Average Total - Inclusion of Equity Values for Non-PEO NEOs ($)
2023			592,059			(22,221)			0			1,940			0			571,778

Compensation Actually Paid vs. Total Shareholder Return

Description of Relationship Between PEO and Non-PEO NEO Compensation Actually Paid and Total Shareholder Return (“TSR”)

The following chart sets forth the relationship between Compensation Actually Paid to our PEO, the average of Compensation Actually Paid to our Non-PEO NEOs, and the cumulative TSR over the four most recently completed fiscal years for the Company and the Peer Group TSR.

Compensation Actually Paid vs. Net Income

Description of Relationship Between PEO and Non-PEO NEO Compensation Actually Paid and Net Income

The following chart sets forth the relationship between Compensation Actually Paid to our PEOs, the average of Compensation Actually Paid to our Non-PEO NEOs, and our net income during the four most recently completed fiscal years.

Compensation Actually Paid vs. Company Selected Measure

Description of Relationship Between PEO and Non-PEO NEO Compensation Actually Paid and Adjusted EBITDA

The following chart sets forth the relationship between Compensation Actually Paid to our PEOs, the average of Compensation Actually Paid to our Non-PEO NEOs, and our Adjusted EBITDA during the four most recently completed fiscal years. This non-GAAP measure is defined and reconciled to the nearest GAAP measure in Appendix B.

Total Shareholder Return Vs Peer Group

Description of Relationship Between PEO and Non-PEO NEO Compensation Actually Paid and Total Shareholder Return (“TSR”)

The following chart sets forth the relationship between Compensation Actually Paid to our PEO, the average of Compensation Actually Paid to our Non-PEO NEOs, and the cumulative TSR over the four most recently completed fiscal years for the Company and the Peer Group TSR.

Tabular List, Table

Free Cash Flow

Environmental Reclamation

Adjusted EBITDA

TRIFR

Safety & Sustainability MS

Total Shareholder Return Amount

$ 269.27

289.69

110.42

26.43

Peer Group Total Shareholder Return Amount

218.23

178.99

157.75

116.44

Net Income (Loss)

$ 759,600,000

$ 1,319,100,000

$ 371,400,000

$ (1,873,800,000)

Company Selected Measure Amount

1,363,900,000

1,844,700,000

916,700,000

258,800,000

Additional 402(v) Disclosure

(2)The amounts shown for Compensation Actually Paid have been calculated in accordance with Item 402(v) of Regulation S-K and do not reflect compensation actually earned, realized, or received by the Company’s NEOs. These amounts reflect the Summary Compensation Table Total with certain adjustments as described in footnote 3 below.

Measure:: 1

Pay vs Performance Disclosure

Name

Free Cash Flow

Measure:: 2

Pay vs Performance Disclosure

Name

Environmental Reclamation

Measure:: 3

Pay vs Performance Disclosure

Name

Adjusted EBITDA

Non-GAAP Measure Description

(5)We determined Adjusted EBITDA to be the most important financial performance measure used to link Company performance to Compensation Actually Paid to our PEO and Non-PEO NEOs in 2023. This performance measure may not have been the most important financial performance measure in prior years and we may determine a different financial performance measure to be the most important financial performance measure in future years. Adjusted EBITDA is a non-GAAP measure and is defined and reconciled to the nearest GAAP measure in Appendix B to this proxy statement.

Measure:: 4

Pay vs Performance Disclosure

Name

TRIFR

Measure:: 5

Pay vs Performance Disclosure

Name

Safety & Sustainability MS

James C. Grech [Member]

Pay vs Performance Disclosure

PEO Total Compensation Amount

$ 5,879,892

$ 3,811,296

$ 4,239,272

PEO Actually Paid Compensation Amount

$ 4,805,574

$ 8,016,084

$ 4,777,733

PEO Name

James C. Grech

James C. Grech

James C. Grech

Glenn L. Kellow [Member]

Pay vs Performance Disclosure

PEO Total Compensation Amount

$ 8,753,812

$ 6,352,911

PEO Actually Paid Compensation Amount

$ 11,945,403

$ (795,179)

PEO Name

Glenn L. Kellow

Glenn L. Kellow

PEO | James C. Grech [Member] | Adjustment, Exclusion Of Stock Awards [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

$ (1,999,968)

PEO | James C. Grech [Member] | Adjustmnet, Inclusion Of Equity Values [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

925,650

PEO | James C. Grech [Member] | Equity Awards Granted During the Year, Unvested [Member]

Pay vs Performance Disclosure

Adjustment to Compensation Amount, Equity Awards

1,697,684

PEO | James C. Grech [Member] | Equity Awards Granted in Prior Years, Unvested [Member]

Pay vs Performance Disclosure

Adjustment to Compensation Amount, Equity Awards

(186,012)

PEO | James C. Grech [Member] | Equity Awards Granted During the Year, Vested [Member]

Pay vs Performance Disclosure

Adjustment to Compensation Amount, Equity Awards

0

PEO | James C. Grech [Member] | Equity Awards Granted in Prior Years, Vested [Member]

Pay vs Performance Disclosure

Adjustment to Compensation Amount, Equity Awards

(586,022)

PEO | James C. Grech [Member] | Equity Awards Granted in Prior Years, Forfeited [Member]

Pay vs Performance Disclosure

Adjustment to Compensation Amount, Equity Awards

0

Non-PEO NEO | Adjustment, Exclusion Of Stock Awards [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

(697,479)

Non-PEO NEO | Adjustmnet, Inclusion Of Equity Values [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

571,778

Non-PEO NEO | Equity Awards Granted During the Year, Unvested [Member]

Pay vs Performance Disclosure

Adjustment to Compensation Amount, Equity Awards

592,059

Non-PEO NEO | Equity Awards Granted in Prior Years, Unvested [Member]

Pay vs Performance Disclosure

Adjustment to Compensation Amount, Equity Awards

(22,221)

Non-PEO NEO | Equity Awards Granted During the Year, Vested [Member]

Pay vs Performance Disclosure

Adjustment to Compensation Amount, Equity Awards

0

Non-PEO NEO | Equity Awards Granted in Prior Years, Vested [Member]

Pay vs Performance Disclosure

Adjustment to Compensation Amount, Equity Awards

1,940

Non-PEO NEO | Equity Awards Granted in Prior Years, Forfeited [Member]

Pay vs Performance Disclosure

Adjustment to Compensation Amount, Equity Awards

$ 0

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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