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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash Flows From Operating Activities    
Net income $ 41,891 $ 47,020
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 93,305 83,676
Deferred compensation 1,606 2,729
Realized and unrealized gains on long-term investments (2,008) (3,740)
Stock-based compensation 4,468 4,480
Deferred income taxes 1,733 (363)
Other non-cash items 1,227 1,756
Changes in assets and liabilities:    
Receivables, net (25,308) (21,688)
Inventories (24,848) (39,003)
Other current assets (7,409) (5,995)
Accounts payable and accrued liabilities 6,524 27,455
Pension liabilities (673) (1,355)
Environmental and legal liabilities (546) 818
Deferred revenues (2,071) (2,023)
Net Cash Provided By Operating Activities 87,891 93,767
Cash Flows From Investing Activities    
Expenditures for property, plant and equipment (87,896) (86,572)
Other, net 6,878 5,831
Net Cash Used In Investing Activities (81,018) (80,741)
Cash Flows From Financing Activities    
Revolving debt and bank overdrafts, net (Note 14) 3,582 83,004
Other debt borrowings (Note 6) 75,000 0
Other debt repayments (Note 6) (48,571) (48,571)
Dividends paid (26,095) (25,289)
Stock option exercises 104 1,023
Other, net (1,760) (3,238)
Net Cash Provided By Financing Activities 2,260 6,929
Effect of Exchange Rate Changes on Cash 9,739 (2,498)
Net Increase in Cash and Cash Equivalents 18,872 17,457
Cash and Cash Equivalents at Beginning of Period 99,665 129,823
Cash and Cash Equivalents at End of Period 118,537 147,280
Supplemental Cash Flow Information    
Cash payments of income taxes, net of refunds 4,065 8,482
Cash payments of interest $ 20,330 $ 21,513