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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
OPERATING ACTIVITIES:    
Net income $ 65,092 $ 64,944
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, and amortization 13,039 12,332
Amortization of deferred financing costs 12 6
Deferred income taxes 7,519 (2,289)
Loss on disposition of property, plant, and equipment 72 290
Stock-based compensation 3,564 4,307
Changes in operating assets and liabilities:    
Trade receivables, net (13,096) (10,410)
Inventories (1,141) 2,091
Prepaid expenses and other current assets 622 1,534
Other assets (1,435) 171
Accounts payable and accrued expenses (3,082) 528
Other liabilities (39) (39)
Net cash provided by operating activities 71,127 73,465
INVESTING ACTIVITIES:    
Purchase of property, plant, and equipment (36,247) (28,126)
Proceeds from sale of property, plant, and equipment 323 241
Net cash used in investing activities (35,924) (27,885)
FINANCING ACTIVITIES:    
Cash dividends paid (3,443) (3,437)
Proceeds from exercise of stock options 128 160
Purchase of treasury shares (370) (424)
Net cash used in financing activities (3,685) (3,701)
Net increase in cash and cash equivalents 31,518 41,879
Cash and cash equivalents at beginning of period 371,124 278,031
Cash and cash equivalents at end of period $ 402,642 $ 319,910