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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Current assets:    
Cash and cash equivalents $ 216,257 $ 98,500
Restricted cash 77 2,532
Short-term investments   207,434
Accounts receivable 42,242 40,749
Allowance for doubtful accounts (327) (364)
Accounts receivable, net 41,915 40,385
Inventories:    
Finished goods 19,202 26,329
Raw materials 2,068 1,799
Total inventories 21,270 28,128
Supplies, prepaid items and other:    
Prepaid insurance 6,153 14,846
Precious metals 12,447 12,094
Supplies 31,257 30,486
Other 2,627 2,337
Total supplies, prepaid items and other 52,484 59,763
Total current assets 332,003 436,742
Property, plant and equipment, net 830,077 835,298
Other assets:    
Operating lease assets 25,602 24,852
Intangible and other assets, net 1,376 1,292
Total other assets 26,978 26,144
Total assets 1,189,058 1,298,184
Current liabilities:    
Accounts payable 61,343 68,323
Short-term financing 4,551 13,398
Accrued and other liabilities 25,543 30,961
Current portion of long-term debt 5,871 5,847
Total current liabilities 97,308 118,529
Long-term debt, net 479,769 575,874
Noncurrent operating lease liabilities 17,491 16,074
Other noncurrent accrued and other liabilities 523 523
Deferred income taxes 71,174 68,853
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 501,422 501,026
Retained earnings 242,193 227,015
Total stockholders' equity 752,732 737,158
Less treasury stock, at cost:    
Common stock, 19.5 million shares (18.1 million shares at December 31, 2023) 229,939 218,827
Total stockholders' equity 522,793 518,331
Total liabilities and stockholders' equity $ 1,189,058 $ 1,298,184