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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of revenues
Revenues	$ 318,622	$ 350,763
Illinois Basin Coal Operations
Disaggregation of revenues
Revenues	190,934	203,872
Appalachia Coal Operations
Disaggregation of revenues
Revenues	108,619	128,103
Oil & Gas Royalties
Disaggregation of revenues
Revenues	14,020	14,263
Coal Royalties
Disaggregation of revenues
Revenues	11,301	11,376
Other and Corporate
Disaggregation of revenues
Revenues	7,768	7,379
Operating segments
Disaggregation of revenues
Revenues	318,622	350,763
Operating segments | Illinois Basin Coal Operations
Disaggregation of revenues
Revenues	190,934	203,872
Operating segments | Appalachia Coal Operations
Disaggregation of revenues
Revenues	108,619	128,103
Operating segments | Oil & Gas Royalties
Disaggregation of revenues
Revenues	14,020	14,263
Operating segments | Coal Royalties
Disaggregation of revenues
Revenues		5
Operating segments | Other and Corporate
Disaggregation of revenues
Revenues	5,049	4,520
Elimination
Disaggregation of revenues
Revenues	(14,020)	(14,230)
Elimination | Coal Royalties
Disaggregation of revenues
Revenues	11,301	11,371
Elimination | Other and Corporate
Disaggregation of revenues
Revenues	2,719	2,859
Coal sales
Disaggregation of revenues
Revenues	287,487	314,637
Coal sales | Illinois Basin Coal Operations
Disaggregation of revenues
Revenues	182,641	199,098
Coal sales | Appalachia Coal Operations
Disaggregation of revenues
Revenues	104,846	115,539
Coal royalties | Coal Royalties
Disaggregation of revenues
Revenues	11,301	11,371
Coal royalties | Elimination
Disaggregation of revenues
Revenues	(11,301)	(11,371)
Oil & gas royalties
Disaggregation of revenues
Revenues	13,999	14,239
Oil & gas royalties | Oil & Gas Royalties
Disaggregation of revenues
Revenues	13,999	14,239
Transportation revenues
Disaggregation of revenues
Revenues	11,068	4,739
Transportation revenues | Illinois Basin Coal Operations
Disaggregation of revenues
Revenues	7,680	3,856
Transportation revenues | Appalachia Coal Operations
Disaggregation of revenues
Revenues	3,388	883
Other revenues
Disaggregation of revenues
Revenues	6,068	17,148
Other revenues | Illinois Basin Coal Operations
Disaggregation of revenues
Revenues	613	918
Other revenues | Appalachia Coal Operations
Disaggregation of revenues
Revenues	385	11,681
Other revenues | Oil & Gas Royalties
Disaggregation of revenues
Revenues	21	24
Other revenues | Coal Royalties
Disaggregation of revenues
Revenues		5
Other revenues | Other and Corporate
Disaggregation of revenues
Revenues	7,768	7,379
Other revenues | Elimination
Disaggregation of revenues
Revenues	$ (2,719)	$ (2,859)

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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