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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
OPERATING ACTIVITIES:    
Net income $ 103,726 $ 81,849
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, and amortization 18,492 18,125
Amortization of deferred financing costs 18 2
Deferred income taxes (245) (825)
Loss (gain) on disposition of property, plant, and equipment 584 (46)
Stock-based compensation 6,221 3,590
Changes in operating assets and liabilities:    
Trade receivables, net (15,314) (14,853)
Inventories (995) (3,470)
Prepaid expenses and other current assets 2,288 1,891
Other assets 164 17
Accounts payable and accrued expenses 4,534 1,214
Other liabilities (67) (80)
Net cash provided by operating activities 119,406 87,414
INVESTING ACTIVITIES:    
Purchase of property, plant, and equipment (42,789) (16,371)
Proceeds from sale of property, plant, and equipment 285 344
Net cash used in investing activities (42,504) (16,027)
FINANCING ACTIVITIES:    
Cash dividends paid (5,155) (4,287)
Proceeds from exercise of stock options 160 130
Purchase of treasury shares (424) (172)
Net cash used in financing activities (5,419) (4,329)
Net increase in cash and cash equivalents 71,483 67,058
Cash and cash equivalents at beginning of period 278,031 187,964
Cash and cash equivalents at end of period $ 349,514 $ 255,022