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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Current assets    
Cash and cash equivalents $ 349,514 $ 278,031
Trade receivables, net 59,296 43,982
Inventories 28,681 27,686
Prepaid expenses and other current assets 2,795 5,083
Total current assets 440,286 354,782
Property, plant, and equipment 535,132 493,246
Less accumulated depreciation and depletion (327,220) (310,355)
Property, plant, and equipment, net 207,912 182,891
Operating lease right-of-use assets 4,153 4,855
Other assets, net 453 635
Total assets 652,804 543,163
Current liabilities    
Accounts payable 11,892 8,819
Current portion of operating lease liabilities 1,643 1,602
Accrued expenses 9,611 6,541
Total current liabilities 23,146 16,962
Deferred tax liabilities, net 23,414 23,659
Operating lease liabilities, excluding current portion 2,674 3,437
Other liabilities 1,301 1,364
Total liabilities 50,535 45,422
Stockholders' equity    
Common stock 2,970 2,968
Additional paid-in capital 46,928 40,549
Retained earnings 614,193 515,622
Less treasury stock, at cost (61,822) (61,398)
Total stockholders' equity 602,269 497,741
Total liabilities and stockholders' equity $ 652,804 $ 543,163