Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash Flows From Operating Activities
Net income	$ 23,414	$ 28,826
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	55,614	52,011
Deferred compensation	2,173	2,245
Realized and unrealized gains on long-term investments	(2,946)	(3,079)
Stock-based compensation	2,930	2,158
Deferred income taxes	6,393	(3,196)
Other non-cash items	977	681
Changes in assets and liabilities:
Receivables, net	(27,345)	22,760
Inventories	(9,686)	70,069
Other current assets	(5,095)	(9,543)
Accounts payable and accrued liabilities	26,602	(116,527)
Pension liabilities	(943)	(998)
Environmental and legal liabilities	171	(8,612)
Deferred revenues	(1,203)	(993)
Net Cash Provided By Operating Activities	71,056	35,802
Cash Flows From Investing Activities
Expenditures for property, plant and equipment	(59,867)	(159,900)
Other, net	5,831	1,669
Net Cash Used In Investing Activities	(54,036)	(158,231)
Cash Flows From Financing Activities
Revolving debt and bank overdrafts, net (Note 14)	27,379	109,448
Other debt repayments (Note 6)	(24,286)	(14,286)
Dividends paid	(16,853)	(16,317)
Stock option exercises	966	1,916
Other, net	(3,211)	(2,805)
Net Cash Provided By (Used In) Financing Activities	(16,005)	77,956
Effect of Exchange Rate Changes on Cash	(6,130)	4,652
Net Decrease in Cash and Cash Equivalents	(5,115)	(39,821)
Cash and Cash Equivalents at Beginning of Period	129,823	173,750
Cash and Cash Equivalents at End of Period	124,708	133,929
Supplemental Cash Flow Information
Cash payments of income taxes, net of refunds	6,022	19,777
Cash payments of interest	$ 14,022	$ 13,492