Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018
Cash Flows From Operating Activities
Net income	[1],[2]	$ 81,068	$ 87,151	[3]
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		58,545	60,778
Deferred compensation		11,478	4,971
Realized and unrealized gains on long-term investments		(2,806)	(1,241)
Stock-based compensation		7,045	6,722
Deferred income taxes	[1]	(2,291)	6,846
Other non-cash items		2,192	1,370
Changes in assets and liabilities:
Receivables, net		(8,959)	(34,807)
Inventories	[1]	25,879	(23,366)
Other current assets		(3,750)	727
Accounts payable and accrued liabilities		(35,330)	(6,906)
Pension liabilities		(979)	(5,059)
Environmental and legal liabilities		800	(763)
Deferred revenues		(243)	(243)
Net Cash Provided By Operating Activities		132,649	96,180
Cash Flows From Investing Activities
Expenditures for property, plant and equipment		(70,829)	(62,895)
Business acquisition (Note 18)			(21,475)
Other, net		2,332	1,684
Net Cash Used In Investing Activities		(68,497)	(82,686)
Cash Flows From Financing Activities
Revolving debt and bank overdrafts, net		(6,929)	1,379
Other debt repayments		(37,143)	(5,714)
Dividends paid		(16,911)	(15,225)
Company stock repurchased		(13,184)	(13,500)
Stock option exercises		2,830	3,488
Other, net		(3,101)	(4,504)
Net Cash Used In Financing Activities		(74,438)	(34,076)
Effect of Exchange Rate Changes on Cash		(3,913)	(4,324)
Net Decrease in Cash and Cash Equivalents		(14,199)	(24,906)
Cash and Cash Equivalents at Beginning of Period		300,194	298,894
Cash and Cash Equivalents at End of Period		285,995	273,988
Supplemental Cash Flow Information
Cash payments of income taxes, net of refunds/payments		21,698	25,190
Cash payments of interest		$ 9,311	$ 8,553

[1] The 2018 amounts for the noted line items have been retrospectively changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from LIFO to FIFO.

[2] The 2018 amounts for the noted line items have been retrospectively changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from the last in, first out (LIFO) basis to the first in, first out (FIFO) basis.

[3] The retained earnings and net income amounts for the noted line items have been changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from LIFO to FIFO.