Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash Flows From Operating Activities
Net income	$ 19,711	$ 13,893
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	29,270	27,604
Deferred compensation	(996)	1,778
Realized and unrealized gains (losses) on long-term investments	493	(2,267)
Stock-based compensation	1,382	1,372
Deferred income taxes	990	2,201
Other non-cash items	125	650
Changes in assets and liabilities:
Receivables, net	(40,348)	(26,043)
Inventories	(16,892)	3,202
Other current assets	(11,070)	(5,931)
Accounts payable and accrued liabilities	27,361	25,965
Pension liabilities	(268)	(502)
Environmental and legal liabilities	(2,076)	(56)
Deferred revenues	(740)	(312)
Net Cash Provided By Operating Activities	6,942	41,554
Cash Flows From Investing Activities
Expenditures for property, plant and equipment	(32,748)	(30,157)
Other, net	6,337	5,742
Net Cash Used In Investing Activities	(26,411)	(24,415)
Cash Flows From Financing Activities
Revolving debt and bank overdrafts, net (Note 14)	33,800	(8,415)
Dividends paid	(8,684)	(8,422)
Stock option exercises	82	865
Other, net	(2,437)	(4,012)
Net Cash Provided By (Used In) Financing Activities	22,761	(19,984)
Effect of Exchange Rate Changes on Cash	4,535	(1,203)
Net Increase (Decrease) in Cash and Cash Equivalents	7,827	(4,048)
Cash and Cash Equivalents at Beginning of Period	99,665	129,823
Cash and Cash Equivalents at End of Period	107,492	125,775
Supplemental Cash Flow Information
Cash payments of income taxes, net of refunds	3,974	4,818
Cash payments of interest	$ 6,761	$ 7,284