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SEGMENT INFORMATION - Segment Results (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Reportable segment results
Revenues	$ 460,863	$ 318,622
Segment Adjusted EBITDA Expense	261,180	197,717
Segment Adjusted EBITDA	170,904	109,821
Total assets	2,225,547	2,151,180	$ 2,159,406
Capital expenditures	59,153	31,437
Illinois Basin
Reportable segment results
Revenues	274,696	190,934
Segment Adjusted EBITDA Expense	177,589	125,581
Segment Adjusted EBITDA	78,215	57,673
Total assets	704,627	740,945
Capital expenditures	36,547	16,401
Appalachia
Reportable segment results
Revenues	145,299	108,619
Segment Adjusted EBITDA Expense	83,715	73,726
Segment Adjusted EBITDA	51,103	31,506
Total assets	425,929	442,595
Capital expenditures	18,345	11,666
Oil & Gas Royalties
Reportable segment results
Revenues	30,961	14,020
Segment Adjusted EBITDA Expense	3,001	2,058
Segment Adjusted EBITDA	28,552	11,946
Total assets	650,794	609,108
Coal Royalties
Reportable segment results
Revenues	15,167	11,301
Segment Adjusted EBITDA Expense	4,819	4,028
Segment Adjusted EBITDA	10,348	7,273
Total assets	291,153	294,333
Other, Corporate and Elimination
Reportable segment results
Revenues	(5,260)	(6,252)
Segment Adjusted EBITDA Expense	(7,944)	(7,676)
Segment Adjusted EBITDA	2,686	1,423
Total assets	153,044	64,199
Capital expenditures	4,261	3,370
Operating segments
Reportable segment results
Revenues	460,863	318,622
Operating segments | Illinois Basin
Reportable segment results
Revenues	274,696	190,934
Operating segments | Appalachia
Reportable segment results
Revenues	145,299	108,619
Operating segments | Oil & Gas Royalties
Reportable segment results
Revenues	30,961	14,020
Operating segments | Other, Corporate and Elimination
Reportable segment results
Revenues	9,907	5,049
Elimination | Coal Royalties
Reportable segment results
Revenues	15,167	11,301
Elimination | Other, Corporate and Elimination
Reportable segment results
Revenues	$ (15,167)	$ (11,301)

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- Definition

Segment Adjusted EBITDA is defined as net income attributable to the entity before net interest expense, income taxes, depreciation, depletion and amortization, general and administrative expense, settlement gain, acquisition gain, debt extinguishment loss and asset impairment.

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