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SEGMENT INFORMATION - Segment Results (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment Information
Number of reportable segments | segment	4
Reportable segment results
Revenues	$ 318,622	$ 350,763
Segment Adjusted EBITDA Expense	197,717	234,698
Segment Adjusted EBITDA	109,821	111,701
Total assets	2,151,180	2,396,421	$ 2,166,016
Capital expenditures	$ 31,437	50,364
Coal Operations
Segment Information
Number of reportable segments | segment	2
Number of mining complex | segment	7
Illinois Basin Coal Operations
Reportable segment results
Revenues	$ 190,934	203,872
Segment Adjusted EBITDA Expense	125,581	156,683
Segment Adjusted EBITDA	57,673	43,333
Total assets	740,945	903,700
Capital expenditures	16,401	26,229
Appalachia Coal Operations
Reportable segment results
Revenues	108,619	128,103
Segment Adjusted EBITDA Expense	73,726	79,918
Segment Adjusted EBITDA	31,506	47,302
Total assets	442,595	504,893
Capital expenditures	11,666	23,571
Oil & Gas Royalties
Reportable segment results
Revenues	14,020	14,263
Segment Adjusted EBITDA Expense	2,058	883
Segment Adjusted EBITDA	11,946	13,755
Total assets	609,108	637,774
Coal Royalties
Reportable segment results
Revenues	11,301	11,376
Segment Adjusted EBITDA Expense	4,028	4,467
Segment Adjusted EBITDA	7,273	6,909
Total assets	294,333	296,328
Other and Corporate
Reportable segment results
Revenues	7,768	7,379
Segment Adjusted EBITDA Expense	4,286	4,642
Segment Adjusted EBITDA	3,481	2,737
Total assets	476,362	506,882
Capital expenditures	3,370	564
Operating segments
Reportable segment results
Revenues	318,622	350,763
Operating segments | Illinois Basin Coal Operations
Reportable segment results
Revenues	190,934	203,872
Operating segments | Appalachia Coal Operations
Reportable segment results
Revenues	108,619	128,103
Operating segments | Oil & Gas Royalties
Reportable segment results
Revenues	14,020	14,263
Operating segments | Coal Royalties
Reportable segment results
Revenues		5
Operating segments | Other and Corporate
Reportable segment results
Revenues	5,049	4,520
Elimination
Reportable segment results
Revenues	(14,020)	(14,230)
Segment Adjusted EBITDA Expense	(11,962)	(11,895)
Segment Adjusted EBITDA	(2,058)	(2,335)
Total assets	(412,163)	(453,156)
Elimination | Coal Royalties
Reportable segment results
Revenues	11,301	11,371
Elimination | Other and Corporate
Reportable segment results
Revenues	$ 2,719	$ 2,859

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