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Segment Information - Results (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Reportable segment results          
Revenues $ 547,463 $ 593,350 $ 1,087,931 $ 1,245,047  
Segment Adjusted EBITDA Expense 354,371 364,197 697,019 725,990  
Other segment items 1,060 544 2,368 1,547  
Segment Adjusted EBITDA 185,354 204,555 366,397 462,914  
Total assets 2,869,446 3,052,946 2,869,446 3,052,946 $ 2,915,730
Capital expenditures 67,017 101,442 153,793 225,288  
Coal royalties          
Reportable segment results          
Revenues 0 0 0 0  
Transportation          
Reportable segment results          
Revenues 8,558 26,701 18,758 57,454  
Transportation expenses 8,558 26,701 18,758 57,454  
Other revenues          
Reportable segment results          
Revenues 17,963 17,561 43,636 39,596  
Operating Segments, Excluding Corporate and Elimination          
Reportable segment results          
Revenues 531,731 579,413 1,051,135 1,212,619  
Operating Segments, Excluding Corporate and Elimination | Illinois Basin Coal          
Reportable segment results          
Revenues 350,247 354,761 693,242 752,602  
Operating Segments, Excluding Corporate and Elimination | Appalachia Coal          
Reportable segment results          
Revenues 145,983 188,212 285,479 386,226  
Operating Segments, Excluding Corporate and Elimination | Oil & Gas Royalties          
Reportable segment results          
Revenues 35,501 36,437 72,414 73,782  
Operating Segments, Excluding Corporate and Elimination | Coal Royalties          
Reportable segment results          
Revenues   3   9  
Operating Segments          
Reportable segment results          
Revenues 549,343 595,997 1,084,542 1,247,905  
Segment Adjusted EBITDA 185,354 204,555 366,397 462,914  
Total assets 2,705,035 2,674,689 2,705,035 2,674,689  
Capital expenditures 65,400 98,766 148,858 221,350  
Operating Segments | Illinois Basin Coal          
Reportable segment results          
Revenues 350,247 354,761 693,242 752,602  
Segment Adjusted EBITDA Expense 231,189 216,168 441,148 449,255  
Segment Adjusted EBITDA 114,229 118,023 240,402 258,301  
Total assets 1,076,634 1,011,972 1,076,634 1,011,972  
Capital expenditures 50,072 65,973 102,657 162,106  
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 4,829 20,570 11,692 45,046  
Transportation expenses 4,829 20,570 11,692 45,046  
Operating Segments | Illinois Basin Coal | Other revenues          
Reportable segment results          
Revenues 1,577 2,218 4,475 4,953  
Operating Segments | Appalachia Coal          
Reportable segment results          
Revenues 145,983 188,212 285,479 386,226  
Segment Adjusted EBITDA Expense 112,829 136,762 233,397 254,264  
Segment Adjusted EBITDA 29,425 45,319 45,016 119,554  
Total assets 472,142 552,796 472,142 552,796  
Capital expenditures 15,226 32,793 46,054 59,244  
Operating Segments | Appalachia Coal | Coal royalties          
Reportable segment results          
Revenues 0 0 0 0  
Operating Segments | Appalachia Coal | Transportation          
Reportable segment results          
Revenues 3,729 6,131 7,066 12,408  
Transportation expenses 3,729 6,131 7,066 12,408  
Operating Segments | Appalachia Coal | Other revenues          
Reportable segment results          
Revenues 626 1,395 1,508 1,883  
Operating Segments | Oil & Gas Royalties          
Reportable segment results          
Revenues 35,501 36,437 72,414 73,782  
Segment Adjusted EBITDA Expense 4,558 4,635 10,279 9,575  
Other segment items 1,060 544 2,368 1,547  
Segment Adjusted EBITDA 29,883 31,258 59,767 62,660  
Total assets 847,300 793,416 847,300 793,416  
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  
Operating Segments | Oil & Gas Royalties | Other revenues          
Reportable segment results          
Revenues 28 8 857 323  
Operating Segments | Coal Royalties          
Reportable segment results          
Revenues 17,612 16,587 33,407 35,295  
Segment Adjusted EBITDA Expense 5,795 6,632 12,195 12,896  
Segment Adjusted EBITDA 11,817 9,955 21,212 22,399  
Total assets 308,959 316,505 308,959 316,505  
Capital expenditures 102   147    
Operating Segments | Coal Royalties | Coal royalties          
Reportable segment results          
Revenues 17,612 16,584 33,407 35,286  
Operating Segments | Coal Royalties | Transportation          
Reportable segment results          
Revenues 0 0 0 0  
Operating Segments | Coal Royalties | Other revenues          
Reportable segment results          
Revenues 0 3 0 9  
Elimination          
Reportable segment results          
Revenues 17,612 16,584 33,407 35,286  
Elimination | Coal Royalties          
Reportable segment results          
Revenues 17,612 16,584 33,407 35,286  
Other, Corporate and Elimination          
Reportable segment results          
Revenues (17,612) (16,584) (33,407) (35,286)  
Total assets 164,411 378,257 164,411 378,257  
Capital expenditures 1,617 2,676 4,935 3,938  
Other, Corporate and Elimination | Other revenues          
Reportable segment results          
Revenues $ 15,732 $ 13,937 $ 36,796 $ 32,428