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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Current assets:    
Cash and cash equivalents $ 5,614 $ 20,230
Short-term investments 119,278 163,971
Accounts receivable 51,653 39,083
Allowance for doubtful accounts (364) (323)
Accounts receivable, net 51,289 38,760
Inventories:    
Finished goods 22,635 22,382
Raw materials 1,812 2,519
Total inventories 24,447 24,901
Supplies, prepaid items and other:    
Prepaid insurance 5,925 14,345
Precious metals 13,198 11,596
Supplies 32,834 31,995
Other 2,627 3,916
Total supplies, prepaid items and other 54,584 61,852
Total current assets 255,212 309,714
Property, plant and equipment, net 838,035 847,570
Other assets:    
Operating lease assets 33,623 28,727
Intangible and other assets, net 1,213 1,177
Total other assets 34,836 29,904
Total assets 1,128,083 1,187,188
Current liabilities:    
Accounts payable 59,577 83,498
Short-term financing 4,127 12,146
Accrued and other liabilities 26,555 30,874
Current portion of long-term debt 6,252 9,116
Total current liabilities 96,511 135,634
Long-term debt, net 446,370 476,163
Noncurrent operating lease liabilities 26,327 21,387
Other noncurrent accrued and other liabilities 456 456
Deferred income taxes 62,619 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 503,496 504,578
Retained earnings 209,028 207,662
Total stockholders' equity 721,641 721,357
Less treasury stock, at cost:    
Common stock, 19.2 million shares (19.5 million shares at December 31, 2024) 225,841 229,717
Total stockholders' equity 495,800 491,640
Total liabilities and stockholders' equity $ 1,128,083 $ 1,187,188