Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash Flows From Operating Activities
Net income	$ 96,935	$ 83,914
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	46,252	45,311
Deferred compensation	(10,907)	3,652
Realized and unrealized (gains) losses on long-term investments	6,972	(2,761)
Stock-based compensation	6,955	5,346
Deferred income taxes	2,241	(39,475)
Goodwill impairment (Note 18)	978
Other non-cash items	1,142	92
Changes in assets and liabilities:
Receivables, net	(111,051)	(68,033)
Inventories	(38,564)	(35,747)
Other current assets	(4,838)	(63)
Accounts payable and accrued liabilities	43,326	34,027
Pension liabilities	(1,113)	(971)
Environmental and legal liabilities	(379)	(463)
Deferred revenues	203	(134)
Net Cash Provided By Operating Activities	38,152	24,695
Cash Flows From Investing Activities
Expenditures for property, plant and equipment	(129,463)	(74,868)
Asset acquisition (Note 17)		(3,503)
Business acquisition, net of cash acquired (Note 17)		(184,560)
Other, net	3,156	1,430
Net Cash Used In Investing Activities	(126,307)	(261,501)
Cash Flows From Financing Activities
Revolving debt and bank overdrafts, net (Note 14)	101,771	4,495
Other debt borrowings (Note 14)	75,000	50,000
Other debt repayments	(14,286)	(14,286)
Dividends paid	(14,985)	(13,724)
Company stock repurchased	(16,976)	(10,895)
Stock option exercises	185	1,087
Other, net	(2,612)	(1,920)
Net Cash Provided By Financing Activities	128,097	14,757
Effect of Exchange Rate Changes on Cash	(4,543)	(836)
Net Increase (Decrease) in Cash and Cash Equivalents	35,399	(222,885)
Cash and Cash Equivalents at Beginning of Period	159,186	349,938
Cash and Cash Equivalents at End of Period	194,585	127,053
Supplemental Cash Flow Information
Cash payments of income taxes, net of refunds/payments	19,353	43,472
Cash payments of interest	$ 7,184	$ 4,622