Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash Flows From Operating Activities
Net income	$ 120,837	$ 96,724
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	67,953	60,859
Deferred compensation	2,148	4,754
Realized and unrealized gains on long-term investments	(2,497)	(2,169)
Stock-based compensation	8,069	7,414
Deferred income taxes	(51,542)	257
Other non-cash items	139	860
Changes in assets and liabilities:
Receivables, net	(96,830)	(28,405)
Inventories	(63,769)	(2,574)
Other current assets	(356)	(4,215)
Accounts payable and accrued liabilities	39,222	12,041
Pension liabilities	(1,434)	(418)
Environmental and legal liabilities	(522)	(3,388)
Deferred revenues	(16)	(62)
Net Cash Provided By Operating Activities	21,402	141,678
Cash Flows From Investing Activities
Expenditures for property, plant and equipment	(119,541)	(84,903)
Asset acquisition (Note 17)	(3,503)	(2,040)
Business acquisition, net of cash acquired (Note 17)	(184,473)	(13,519)
Other, net	1,480	2,332
Net Cash Used In Investing Activities	(306,037)	(98,130)
Cash Flows From Financing Activities
Revolving debt and bank overdrafts, net (Note 14)	9,799
Other debt borrowings (Note 14)	100,000
Other debt repayments	(28,572)	(14,286)
Dividends paid	(20,572)	(18,547)
Company stock repurchased	(16,969)	(13,753)
Stock option exercises	1,087	2,835
Other, net	(1,801)	(889)
Net Cash (Used In) Provided By Financing Activities	42,972	(44,640)
Effect of Exchange Rate Changes on Cash	(3,007)	(3,899)
Net Decrease in Cash and Cash Equivalents	(244,670)	(4,991)
Cash and Cash Equivalents at Beginning of Period	349,938	315,383
Cash and Cash Equivalents at End of Period	105,268	310,392
Supplemental Cash Flow Information
Cash payments of income taxes, net of refunds/payments	85,271	27,420
Cash payments of interest	$ 6,885	$ 6,916