Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash Flows From Operating Activities
Net income	$ 28,826	$ 96,935
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	52,011	46,252
Deferred compensation	2,245	(10,907)
Realized and unrealized (gains) losses on long-term investments	(3,079)	6,972
Stock-based compensation	2,158	6,955
Deferred income taxes	(3,196)	2,241
Goodwill impairment (Note 16)		978
Other non-cash items	681	1,142
Changes in assets and liabilities:
Receivables, net	22,760	(111,051)
Inventories	70,069	(38,564)
Other current assets	(9,543)	(4,838)
Accounts payable and accrued liabilities	(116,527)	43,326
Pension liabilities	(998)	(1,113)
Environmental and legal liabilities	(8,612)	(379)
Deferred revenues	(993)	203
Net Cash Provided By Operating Activities	35,802	38,152
Cash Flows From Investing Activities
Expenditures for property, plant and equipment	(159,900)	(129,463)
Other, net	1,669	3,156
Net Cash Used In Investing Activities	(158,231)	(126,307)
Cash Flows From Financing Activities
Revolving debt and bank overdrafts, net (Note 14)	109,448	101,771
Other debt borrowings (Note 14)		75,000
Other debt repayments	(14,286)	(14,286)
Dividends paid	(16,317)	(14,985)
Company stock repurchased		(16,976)
Stock option exercises	1,916	185
Other, net	(2,805)	(2,612)
Net Cash Provided By Financing Activities	77,956	128,097
Effect of Exchange Rate Changes on Cash	4,652	(4,543)
Net Increase (Decrease) in Cash and Cash Equivalents	(39,821)	35,399
Cash and Cash Equivalents at Beginning of Period	173,750	159,186
Cash and Cash Equivalents at End of Period	133,929	194,585
Supplemental Cash Flow Information
Cash payments of income taxes, net of refunds/payments	19,777	19,353
Cash payments of interest	$ 13,492	$ 7,184