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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Current assets    
Cash and cash equivalents $ 383,165 $ 371,124
Trade receivables, net 58,111 47,933
Inventories 30,607 30,908
Prepaid expenses and other current assets 4,382 5,351
Total current assets 476,265 455,316
Property, plant, and equipment 570,861 554,612
Less accumulated depreciation and depletion (338,769) (333,191)
Property, plant, and equipment, net 232,092 221,421
Operating lease right-of-use assets 3,481 3,864
Other assets, net 1,999 443
Total assets 713,837 681,044
Current liabilities    
Accounts payable 11,714 14,516
Current portion of operating lease liabilities 1,618 1,643
Accrued expenses 9,643 7,473
Total current liabilities 22,975 23,632
Deferred tax liabilities, net 26,429 22,999
Operating lease liabilities, excluding current portion 2,008 2,370
Other liabilities 1,266 1,283
Total liabilities 52,678 50,284
Stockholders' equity    
Common stock 2,976 2,975
Additional paid-in capital 50,745 48,839
Retained earnings 671,887 643,025
Less treasury stock, at cost (64,449) (64,079)
Total stockholders' equity 661,159 630,760
Total liabilities and stockholders' equity $ 713,837 $ 681,044