v3.25.2
Segment Information (Reportable Segment 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          
Total revenues $ 467,879 $ 673,828 $ 917,127 $ 1,341,977  
Mining costs (338,062) (364,418) (726,885) (829,865)  
Other operating costs (124,221) (182,905) (249,083) (363,411)  
Total operating costs (462,283) (547,323) (975,968) (1,193,276)  
Other and unallocated costs (6,166) (5,716) (14,545) (13,295)  
Adjusted EBITDA (570) 120,789 (73,386) 135,406  
Total assets 2,578,382 2,618,782 2,578,382 2,618,782 $ 2,517,752
Capital expenditures 84,121 64,478 204,169 136,777  
Operating Segments [Member]          
Reportable segment results          
Capital expenditures     204,169 136,777  
Other and Corporate [Member]          
Reportable segment results          
Total revenues 0 0 0 0  
Mining costs 0 0 0 0  
Other operating costs 0 0 0 0  
Total operating costs 0 0 0 0  
Other and unallocated costs (7,551) (8,259) (15,915) (16,642)  
Adjusted EBITDA (7,551) (8,259) (15,915) (16,642)  
Total assets 195,828 276,880 195,828 276,880  
Capital expenditures 2,872 113 5,237 119  
Australia Segment [Member] | Operating Segments [Member]          
Reportable segment results          
Total revenues 259,845 458,491 533,122 894,596  
Mining costs (179,256) (218,897) (421,266) (536,762)  
Other operating costs (92,216) (145,771) (188,574) (290,640)  
Total operating costs (271,472) (364,668) (609,840) (827,402)  
Other and unallocated costs 1,427 759 1,674 1,160  
Adjusted EBITDA (10,200) 94,582 (75,044) 68,354  
Total assets 1,325,017 1,279,668 1,325,017 1,279,668  
Capital expenditures 46,277 15,969 96,013 35,470  
United States Segment [Member] | Operating Segments [Member]          
Reportable segment results          
Total revenues 208,034 215,337 384,005 447,381  
Mining costs (158,806) (145,521) (305,619) (293,103)  
Other operating costs (32,005) (37,134) (60,509) (72,771)  
Total operating costs (190,811) (182,655) (366,128) (365,874)  
Other and unallocated costs (42) 1,784 (304) 2,187  
Adjusted EBITDA 17,181 34,466 17,573 83,694  
Total assets 1,057,537 1,062,234 1,057,537 1,062,234  
Capital expenditures $ 34,972 $ 48,396 $ 102,919 $ 101,188