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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Current assets:    
Cash and cash equivalents $ 307,595 $ 365,974
Short-term investments 30,887 49,582
Trade accounts receivable, net of allowance for credit losses of $2,714 and $2,519 as of June 30, 2026 and December 31, 2025, respectively 230,565 278,620
Inventories, net 262,435 193,000
Prepaid expenses and other current assets 30,981 31,132
Total current assets 862,463 918,308
Property, plant, and equipment, net of accumulated depreciation and amortization of $837,738 and $774,101 as of June 30, 2026 and December 31, 2025, respectively 637,737 621,866
Owned and leased mineral rights, net of accumulated depletion and amortization of $162,223 and $150,616 as of June 30, 2026 and December 31, 2025, respectively 408,456 416,944
Other acquired intangibles, net of accumulated amortization of $44,825 and $43,072 as of June 30, 2026 and December 31, 2025, respectively 32,700 34,452
Long-term restricted cash 128,219 126,911
Long-term restricted investments 34,453 34,356
Deferred income taxes 8,361 8,087
Other non-current assets 143,358 119,702
Total assets 2,255,747 2,280,626
Current liabilities:    
Current portion of long-term debt 3,199 3,575
Trade accounts payable 86,714 66,169
Accrued expenses and other current liabilities 163,346 135,778
Total current liabilities 253,259 205,522
Long-term debt 8,202 9,841
Workers’ compensation and black lung obligations 188,596 190,965
Pension obligations 76,077 87,317
Asset retirement obligations 204,242 204,745
Deferred income taxes 5,237 15,433
Other non-current liabilities 21,315 21,308
Total liabilities 756,928 735,131
Commitments and Contingencies (Note 14)
Stockholders’ Equity    
Preferred stock - par value $0.01, 5,000,000 shares authorized, none issued 0 0
Common stock - par value $0.01, 50,000,000 shares authorized, 22,496,891 issued and 12,685,495 outstanding at June 30, 2026 and 22,437,379 issued and 12,805,909 outstanding at December 31, 2025 225 224
Additional paid-in capital 860,001 852,030
Accumulated other comprehensive loss (55,187) (60,433)
Treasury stock, at cost: 9,811,396 shares at June 30, 2026 and 9,631,470 shares at December 31, 2025 (1,377,653) (1,341,027)
Retained earnings 2,071,433 2,094,701
Total stockholders’ equity 1,498,819 1,545,495
Total liabilities and stockholders’ equity $ 2,255,747 $ 2,280,626