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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
OPERATING ACTIVITIES:    
Net income $ 30,582 $ 34,113
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, and amortization 6,598 6,137
Amortization of deferred financing costs 6 6
Deferred income taxes 3,430 (571)
Loss on disposition of property, plant, and equipment 75 106
Stock-based compensation 1,779 2,336
Changes in operating assets and liabilities:    
Trade receivables, net (10,178) (11,790)
Inventories 301 (174)
Prepaid expenses and other current assets 969 1,012
Other assets (1,562) 164
Accounts payable and accrued expenses 82 8,113
Other liabilities (20) (18)
Net cash provided by operating activities 32,062 39,434
INVESTING ACTIVITIES:    
Purchase of property, plant, and equipment (18,340) (14,852)
Proceeds from sale of property, plant, and equipment 281 4
Net cash used in investing activities (18,059) (14,848)
FINANCING ACTIVITIES:    
Cash dividends paid (1,720) (1,719)
Proceeds from exercise of stock options 128 160
Purchase of treasury shares (370) (424)
Net cash used in financing activities (1,962) (1,983)
Net increase in cash and cash equivalents 12,041 22,603
Cash and cash equivalents at beginning of period 371,124 278,031
Cash and cash equivalents at end of period $ 383,165 $ 300,634