v3.25.4
Segment Information (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disaggregation of Revenue [Line Items]      
Other revenues $ 29,371 $ 62,851 $ 59,914
Total 1,949,787 2,507,713 2,890,603
Other and Corporate [Member]      
Disaggregation of Revenue [Line Items]      
Total 0 0 0
Metallurgical Coal [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 1,759,105 2,327,064 2,588,483
Thermal Coal [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 161,311 117,798 242,206
Total Coal Revenue [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 1,920,416 2,444,862 2,830,689
Australia Segment [Member] | Operating Segments [Member]      
Disaggregation of Revenue [Line Items]      
Other revenues 28,569 34,706 35,770
Total 1,185,298 1,594,981 1,681,522
Australia Segment [Member] | Metallurgical Coal [Member] | Operating Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 1,024,828 1,472,477 1,557,471
Australia Segment [Member] | Thermal Coal [Member] | Operating Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 131,901 87,798 88,281
Australia Segment [Member] | Total Coal Revenue [Member] | Operating Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 1,156,729 1,560,275 1,645,752
United States Segment [Member] | Operating Segments [Member]      
Disaggregation of Revenue [Line Items]      
Other revenues 802 28,145 24,144
Total 764,489 912,732 1,209,081
United States Segment [Member] | Metallurgical Coal [Member] | Operating Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 734,277 854,587 1,031,012
United States Segment [Member] | Thermal Coal [Member] | Operating Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenues 29,410 30,000 153,925
United States Segment [Member] | Total Coal Revenue [Member]      
Disaggregation of Revenue [Line Items]      
Termination fee revenue   25,000 17,500
United States Segment [Member] | Total Coal Revenue [Member] | Operating Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenues $ 763,687 $ 884,587 $ 1,184,937