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Segment Information - Results (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Reportable segment results          
Revenues $ 571,367 $ 613,569 $ 1,659,298 $ 1,858,616  
Segment Adjusted EBITDA Expense 366,232 394,723 1,063,251 1,120,713  
Other segment items 986 138 3,354 1,685  
Segment Adjusted EBITDA 204,260 191,931 570,657 654,845  
Total assets 2,908,341 3,032,173 2,908,341 3,032,173 $ 2,915,730
Capital expenditures 64,728 110,298 218,521 335,586  
Coal royalties          
Reportable segment results          
Revenues 0 0 0 0  
Transportation          
Reportable segment results          
Revenues 7,701 24,617 26,459 82,071  
Transportation expenses 7,701 24,617 26,459 82,071  
Other revenues          
Reportable segment results          
Revenues 20,018 21,857 63,654 61,453  
Operating Segments, Excluding Corporate and Elimination          
Reportable segment results          
Revenues 554,517 594,762 1,605,652 1,807,381  
Operating Segments, Excluding Corporate and Elimination | Illinois Basin Coal          
Reportable segment results          
Revenues 343,892 356,911 1,037,134 1,109,513  
Operating Segments, Excluding Corporate and Elimination | Appalachia Coal          
Reportable segment results          
Revenues 177,867 203,163 463,346 589,389  
Operating Segments, Excluding Corporate and Elimination | Oil & Gas Royalties          
Reportable segment results          
Revenues 32,758 34,688 105,172 108,470  
Operating Segments, Excluding Corporate and Elimination | Coal Royalties          
Reportable segment results          
Revenues 0 0 0 9  
Operating Segments          
Reportable segment results          
Revenues 579,179 611,409 1,663,721 1,859,314  
Segment Adjusted EBITDA 204,260 191,931 570,657 654,845  
Total assets 2,690,068 2,683,214 2,690,068 2,683,214  
Capital expenditures 63,963 100,983 212,821 322,333  
Operating Segments | Illinois Basin Coal          
Reportable segment results          
Revenues 343,892 356,911 1,037,134 1,109,513  
Segment Adjusted EBITDA Expense 233,806 225,498 674,954 674,753  
Other segment items 0 0 0 0  
Segment Adjusted EBITDA 105,361 114,649 345,763 372,950  
Total assets 1,046,853 1,029,389 1,046,853 1,029,389  
Capital expenditures 50,167 68,512 152,824 230,618  
Operating Segments | Illinois Basin Coal | Coal royalties          
Reportable segment results          
Revenues 0 0 0 0  
Operating Segments | Illinois Basin Coal | Transportation          
Reportable segment results          
Revenues 4,725 16,764 16,417 61,810  
Transportation expenses 4,725 16,764 16,417 61,810  
Operating Segments | Illinois Basin Coal | Other revenues          
Reportable segment results          
Revenues 1,790 2,331 6,265 7,284  
Operating Segments | Appalachia Coal          
Reportable segment results          
Revenues 177,867 203,163 463,346 589,389  
Segment Adjusted EBITDA Expense 120,802 157,792 354,199 412,056  
Other segment items 0 0 0 0  
Segment Adjusted EBITDA 54,089 37,518 99,105 157,072  
Total assets 477,756 534,449 477,756 534,449  
Capital expenditures 13,631 32,471 59,685 91,715  
Operating Segments | Appalachia Coal | Coal royalties          
Reportable segment results          
Revenues 0 0 0 0  
Operating Segments | Appalachia Coal | Transportation          
Reportable segment results          
Revenues 2,976 7,853 10,042 20,261  
Transportation expenses 2,976 7,853 10,042 20,261  
Operating Segments | Appalachia Coal | Other revenues          
Reportable segment results          
Revenues 675 479 2,183 2,362  
Operating Segments | Oil & Gas Royalties          
Reportable segment results          
Revenues 32,758 34,688 105,172 108,470  
Segment Adjusted EBITDA Expense 4,052 5,844 14,331 15,419  
Other segment items 986 138 3,354 1,685  
Segment Adjusted EBITDA 27,720 28,706 87,487 91,366  
Total assets 861,938 806,332 861,938 806,332  
Capital expenditures 0 0 0 0  
Operating Segments | Oil & Gas Royalties | Coal royalties          
Reportable segment results          
Revenues 0 0 0 0  
Operating Segments | Oil & Gas Royalties | Transportation          
Reportable segment results          
Revenues 0 0 0 0  
Transportation expenses 0 0 0 0  
Operating Segments | Oil & Gas Royalties | Other revenues          
Reportable segment results          
Revenues 703 240 1,560 563  
Operating Segments | Coal Royalties          
Reportable segment results          
Revenues 24,662 16,647 58,069 51,942  
Segment Adjusted EBITDA Expense 7,572 5,589 19,767 18,485  
Other segment items 0 0 0 0  
Segment Adjusted EBITDA 17,090 11,058 38,302 33,457  
Total assets 303,521 313,044 303,521 313,044  
Capital expenditures 165 0 312 0  
Operating Segments | Coal Royalties | Coal royalties          
Reportable segment results          
Revenues 24,662 16,647 58,069 51,933  
Operating Segments | Coal Royalties | Transportation          
Reportable segment results          
Revenues 0 0 0 0  
Transportation expenses 0 0 0 0  
Operating Segments | Coal Royalties | Other revenues          
Reportable segment results          
Revenues 0 0 0 9  
Elimination          
Reportable segment results          
Revenues 24,662 16,647 58,069 51,933  
Elimination | Illinois Basin Coal          
Reportable segment results          
Revenues 0 0 0 0  
Elimination | Appalachia Coal          
Reportable segment results          
Revenues 0 0 0 0  
Elimination | Oil & Gas Royalties          
Reportable segment results          
Revenues 0 0 0 0  
Elimination | Coal Royalties          
Reportable segment results          
Revenues 24,662 16,647 58,069 51,933  
Other, Corporate and Elimination          
Reportable segment results          
Revenues (24,662) (16,647) (58,069) (51,933)  
Total assets 218,273 348,959 218,273 348,959  
Capital expenditures 765 9,315 5,700 13,253  
Other, Corporate and Elimination | Other revenues          
Reportable segment results          
Revenues $ 16,850 $ 18,807 $ 53,646 $ 51,235