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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Current assets:    
Cash and cash equivalents $ 20,641 $ 19,511
Short-term investments 161,042 128,960
Accounts receivable 52,864 57,609
Allowance for doubtful accounts (363) (401)
Accounts receivable, net 52,501 57,208
Inventories:    
Finished goods 20,906 16,705
Raw materials 2,334 1,605
Total inventories 23,240 18,310
Supplies, prepaid items and other:    
Prepaid insurance 8,953 12,588
Precious metals 15,793 14,538
Supplies 34,080 33,399
Other 4,051 5,380
Total supplies, prepaid items and other 62,877 65,905
Assets held for sale 1,000 3,400
Total current assets 321,301 293,294
Property, plant and equipment, net 825,572 833,525
Other assets:    
Operating lease assets 43,416 45,571
Intangible and other assets, net 1,068 1,149
Total other assets 44,484 46,720
Total assets 1,191,357 1,173,539
Current liabilities:    
Accounts payable 62,465 64,514
Short-term financing 7,186 10,686
Accrued and other liabilities 34,143 29,551
Current portion of long-term debt 770 760
Total current liabilities 104,564 105,511
Long-term debt, net 440,433 440,295
Noncurrent operating lease liabilities 35,774 37,668
Other noncurrent accrued and other liabilities 535 535
Deferred income taxes 67,102 69,557
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 507,655 506,821
Retained earnings 251,960 232,275
Total stockholders' equity 768,732 748,213
Less treasury stock, at cost:    
Common stock, 19.3 million shares (19.5 million shares at December 31, 2025) 225,783 228,240
Total stockholders' equity 542,949 519,973
Total liabilities and stockholders' equity $ 1,191,357 $ 1,173,539