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SEGMENT INFORMATION - Segment Results (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reportable segment results
Revenues	$ 1,961,720	$ 2,002,857	$ 1,796,220
Segment Adjusted EBITDA Expense	1,204,896	1,211,800	1,092,187
Segment Adjusted EBITDA	672,001	715,691	682,028
Total assets	2,586,694	2,394,748	2,219,371
Capital expenditures	305,858	233,480	145,088
Illinois Basin
Reportable segment results
Revenues	1,236,308	1,321,089	1,125,864
Segment Adjusted EBITDA Expense	756,423	796,370	692,199
Segment Adjusted EBITDA	385,200	417,773	398,080
Total assets	1,373,516	1,380,912	1,437,627
Capital expenditures	189,270	166,468	94,374
Appalachia
Reportable segment results
Revenues	644,389	643,965	626,041
Segment Adjusted EBITDA Expense	423,623	398,243	385,802
Segment Adjusted EBITDA	215,950	240,286	234,124
Total assets	500,027	440,518	470,892
Capital expenditures	111,739	64,037	48,358
Minerals
Reportable segment results
Revenues	53,036
Segment Adjusted EBITDA Expense	7,811
Segment Adjusted EBITDA	46,997	21,323	13,297
Total assets	643,213	161,312	147,970
Other and Corporate
Reportable segment results
Revenues	56,850	81,492	114,749
Segment Adjusted EBITDA Expense	36,845	52,321	75,851
Segment Adjusted EBITDA	32,911	44,864	45,296
Total assets	541,261	589,010	349,918
Capital expenditures	4,849	2,975	2,356
Operating segments
Reportable segment results
Revenues	1,961,720	2,002,857	1,796,220
Operating segments | Illinois Basin
Reportable segment results
Revenues	1,219,618	1,289,898	1,069,767
Operating segments | Appalachia
Reportable segment results
Revenues	644,389	643,898	623,720
Operating segments | Minerals
Reportable segment results
Revenues	53,036
Operating segments | Other and Corporate
Reportable segment results
Revenues	44,677	69,061	102,733
Elimination
Reportable segment results
Revenues	(28,863)	(43,689)	(70,434)
Segment Adjusted EBITDA Expense	(19,806)	(35,134)	(61,665)
Segment Adjusted EBITDA	(9,057)	(8,555)	(8,769)
Total assets	(471,323)	(177,004)	(187,036)
Elimination | Illinois Basin
Reportable segment results
Revenues	16,690	31,191	56,097
Elimination | Appalachia
Reportable segment results
Revenues		67	2,321
Elimination | Other and Corporate
Reportable segment results
Revenues	$ 12,173	$ 12,431	$ 12,016

X

- 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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