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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 365,557 $ 636,170 $ 588,158
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, depletion and amortization 285,446 267,982 276,670
Non-cash compensation expense 10,614 12,864 11,029
Coal inventory adjustment to market 24,568 33,296 364
Equity method investment loss (income) 4,961 1,468 (5,634)
Distributions from equity method investments 2,377 2,567 5,634
Net gain on sale of property, plant and equipment (262) (3,230) (3,665)
Asset impairment 31,130    
Change in deferred income tax (2,185) (8,973) 34,775
Change in fair value of digital assets (22,395)    
Other non-cash change in digital assets (10,358) (12,516) (307)
Other 20,844 10,316 1,455
Changes in operating assets and liabilities:      
Trade receivables 115,793 (41,210) (108,893)
Other receivables (1,201) (1,077) (7,921)
Inventories, net (22,243) (78,004) (20,138)
Prepaid expenses and other assets (3,068) 4,108 (5,014)
Advance royalties (2,781) (3,636) (6,787)
Accounts payable (19,223) 17,842 14,580
Accrued taxes other than income taxes 44 (1,960) 5,180
Accrued payroll and related benefits (2,938) (9,739) 2,818
Pneumoconiosis benefits 9,199 3,924 3,849
Workers' compensation (105) (1,477) (3,996)
Other 19,357 (4,484) 20,192
Total net adjustments 437,574 188,061 214,191
Net cash provided by operating activities 803,131 824,231 802,349
Property, plant and equipment:      
Capital expenditures (428,741) (379,338) (286,394)
Change in accounts payable and accrued liabilities 9,142 (29,695) 35,956
Proceeds from sale of property, plant and equipment 1,626 3,710 7,468
Contributions to equity method investments (2,896) (2,518) (24,087)
Purchase of equity securities   (49,560) (42,000)
JC Resources acquisition   (64,999)  
Oil & gas reserve business combinations   (14,459) (92,618)
Oil & gas reserve asset acquisitions (24,733) (24,225)  
Other 4,938 7,762 (1,663)
Net cash used in investing activities (440,664) (553,322) (403,338)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Borrowings under securitization facility 75,000   27,500
Payments under securitization facility (75,000)   (27,500)
Proceeds from equipment financings 54,626    
Payments on equipment financings (11,981) (24,970) (16,071)
Borrowings under revolving credit facilities 20,000    
Payments under revolving credit facilities (20,000)    
Borrowing under long-term debt 400,000 75,000  
Payments on long-term debt (299,842) (129,455)  
Payment of debt issuance costs (11,442) (12,376)  
Payments for purchases of units under unit repurchase program   (19,432)  
Payments for purchase of units and tax withholdings related to settlements under deferred compensation plans (15,544) (10,334)  
Cash settlement of grants under deferred compensation plans (21,786)    
Excess purchase price over the contributed basis from JC Resources acquisition   (7,251)  
Cash retained by JC Resources in acquisition   (2,933) (10,537)
Distributions paid to Partners (363,430) (364,579) (196,347)
Other (15,919) (10,789) (2,436)
Net cash used in financing activities (285,318) (507,119) (225,391)
NET CHANGE IN CASH AND CASH EQUIVALENTS 77,149 (236,210) 173,620
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 59,813 296,023 122,403
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 136,962 $ 59,813 $ 296,023