Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash Flows From Operating Activities
Net income	$ 13,893	$ 16,142
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	27,604	25,542
Deferred compensation	1,778	1,502
Realized and unrealized gains on long-term investments	(2,267)	(1,516)
Stock-based compensation	1,372	999
Deferred income taxes	2,201	(660)
Other non-cash items	650	36
Changes in assets and liabilities:
Receivables, net	(26,043)	(40,420)
Inventories	3,202	38,265
Other current assets	(5,931)	(9,222)
Accounts payable and accrued liabilities	25,965	(98,523)
Pension liabilities	(502)	(531)
Environmental and legal liabilities	(56)	(3,464)
Deferred revenues	(312)	(208)
Net Cash Provided By (Used In) Operating Activities	41,554	(72,058)
Cash Flows From Investing Activities
Expenditures for property, plant and equipment	(30,157)	(92,158)
Other, net	5,742	1,817
Net Cash Used In Investing Activities	(24,415)	(90,341)
Cash Flows From Financing Activities
Revolving debt and bank overdrafts, net (Note 14)	(8,415)	123,847
Dividends paid	(8,422)	(8,160)
Stock option exercises	865	1,514
Other, net	(4,012)	(3,665)
Net Cash Provided By (Used In) Financing Activities	(19,984)	113,536
Effect of Exchange Rate Changes on Cash	(1,203)	2,069
Net Decrease in Cash and Cash Equivalents	(4,048)	(46,794)
Cash and Cash Equivalents at Beginning of Period	129,823	173,750
Cash and Cash Equivalents at End of Period	125,775	126,956
Supplemental Cash Flow Information
Cash payments of income taxes, net of refunds	4,818	15,518
Cash payments of interest	$ 7,284	$ 6,007