Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash Flows From Operating Activities
Net income	$ 16,142	$ 44,809
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	25,542	22,915
Deferred compensation	1,502	(7,501)
Realized and unrealized (gains) losses on long-term investments	(1,516)	2,487
Stock-based compensation	999	2,957
Deferred income taxes	(660)	(2,545)
Other non-cash items	36	1,031
Changes in assets and liabilities:
Receivables, net	(40,420)	(80,344)
Inventories	38,265	481
Other current assets	(9,222)	(3,915)
Accounts payable and accrued liabilities	(98,523)	(1,183)
Pension liabilities	(531)	(599)
Environmental and legal liabilities	(3,464)	56
Deferred revenues	(208)	421
Net Cash Used In By Operating Activities	(72,058)	(20,930)
Cash Flows From Investing Activities
Expenditures for property, plant and equipment	(92,158)	(60,288)
Other, net	1,817	3,156
Net Cash Used In Investing Activities	(90,341)	(57,132)
Cash Flows From Financing Activities
Revolving debt and bank overdrafts, net (Note 14)	123,847	98,636
Other debt borrowings (Note 14)		75,000
Dividends paid	(8,160)	(7,513)
Company stock repurchased		(9,935)
Stock option exercises	1,514	114
Other, net	(3,665)	(1,469)
Net Cash Provided By Financing Activities	113,536	154,833
Effect of Exchange Rate Changes on Cash	2,069	84
Net Increase (Decrease) in Cash and Cash Equivalents	(46,794)	76,855
Cash and Cash Equivalents at Beginning of Period	173,750	159,186
Cash and Cash Equivalents at End of Period	126,956	236,041
Supplemental Cash Flow Information
Cash payments of income taxes, net of refunds/payments	15,518	8,312
Cash payments of interest	$ 6,007	$ 2,500