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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Current assets:    
Cash and cash equivalents $ 45,072 $ 63,769
Short-term investments 268,762 330,553
Accounts receivable 51,431 75,494
Allowance for doubtful accounts (692) (699)
Accounts receivable, net 50,739 74,795
Inventories:    
Finished goods 21,281 28,893
Raw materials 1,420 1,990
Total inventories 22,701 30,883
Supplies, prepaid items and other:    
Prepaid insurance 7,084 17,429
Precious metals 13,100 13,323
Supplies 29,730 27,501
Other 2,904 8,346
Total supplies, prepaid items and other 52,818 66,599
Total current assets 440,092 566,599
Property, plant and equipment, net 835,423 848,661
Other assets:    
Operating lease assets 25,050 22,682
Intangible and other assets, net 1,572 1,877
Total other assets 26,622 24,559
Total assets 1,302,137 1,439,819
Current liabilities:    
Accounts payable 54,524 78,182
Short-term financing 5,118 16,134
Accrued and other liabilities 31,210 38,470
Current portion of long-term debt 5,371 9,522
Total current liabilities 96,223 142,308
Long-term debt, net 578,214 702,733
Noncurrent operating lease liabilities 16,158 14,896
Other noncurrent accrued and other liabilities 522 522
Deferred income taxes 71,223 63,487
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 498,517 497,179
Retained earnings 240,088 199,092
Stockholders equity including treasury stock 747,722 705,388
Less treasury stock, at cost:    
Common stock, 16.8 million shares (14.9 million shares at December 31, 2022) 207,925 189,515
Total stockholders' equity 539,797 515,873
Total Liabilities and Stockholders' equity $ 1,302,137 $ 1,439,819