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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Current assets:    
Cash and cash equivalents $ 27,951 $ 20,230
Short-term investments 124,015 163,971
Accounts receivable 47,029 39,083
Allowance for doubtful accounts (384) (323)
Accounts receivable, net 46,645 38,760
Inventories:    
Finished goods 18,391 22,382
Raw materials 1,408 2,519
Total inventories 19,799 24,901
Supplies, prepaid items and other:    
Prepaid insurance 1,704 14,345
Precious metals 12,143 11,596
Supplies 33,163 31,995
Other 2,349 3,916
Total supplies, prepaid items and other 49,359 61,852
Assets held for sale 2,851  
Total current assets 270,620 309,714
Property, plant and equipment, net 833,252 847,570
Other assets:    
Operating lease assets 44,444 28,727
Intangible and other assets, net 1,232 1,177
Total other assets 45,676 29,904
Total assets 1,149,548 1,187,188
Current liabilities:    
Accounts payable 59,994 83,498
Short-term financing 1,384 12,146
Accrued and other liabilities 33,107 30,874
Current portion of long-term debt 817 9,116
Total current liabilities 95,302 135,634
Long-term debt, net 447,582 476,163
Noncurrent operating lease liabilities 36,579 21,387
Other noncurrent accrued and other liabilities 456 456
Deferred income taxes 65,020 61,908
Commitments and contingencies (Note 5)
Stockholders' equity:    
Common stock, $.10 par value; 150 million shares authorized, 91.2 million shares issued 9,117 9,117
Capital in excess of par value 505,072 504,578
Retained earnings 216,143 207,662
Total stockholders' equity 730,332 721,357
Less treasury stock, at cost:    
Common stock, 19.2 million shares (19.5 million shares at December 31, 2024) 225,723 229,717
Total stockholders' equity 504,609 491,640
Total liabilities and stockholders' equity $ 1,149,548 $ 1,187,188