Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Cash Flows From Operating Activities
Net income	[1]	$ 31,912	$ 27,919	[2]
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		18,707	18,070
Deferred compensation		376	2,720
Realized and unrealized (gains) losses on long-term investments		(1,645)	306
Stock-based compensation		1,385	2,423
Deferred income taxes		2,543	2,683
Other non-cash items		721	20
Changes in assets and liabilities:
Receivables, net		(20,263)	(36,263)
Inventories		(14,396)	(5,274)
Other current assets		(1,694)	(315)
Accounts payable and accrued liabilities		(14,184)	(14,846)
Pension liabilities		(127)	156
Environmental and legal liabilities		24	837
Deferred revenues		(81)	(282)
Net Cash (Used In) Provided By Operating Activities	[3]	3,278	(1,846)
Cash Flows From Investing Activities
Expenditures for property, plant and equipment		(20,396)	(19,340)
Business acquisition (Note 15)		(4,339)
Other, net		(1,887)	(3,119)
Net Cash Used In Investing Activities		(26,622)	(22,459)
Cash Flows From Financing Activities
Revolving debt and bank overdrafts, net			(3,588)
Other debt repayments		(441)	(159)
Dividends paid		(4,606)	(4,237)
Company stock repurchased		(1,500)	(908)
Stock option exercises		835	258
Other, net		(1,486)	(235)
Net Cash Used In Financing Activities	[3]	(7,198)	(8,869)
Effect of Exchange Rate Changes on Cash		2,608	2,700
Net Decrease in Cash and Cash Equivalents		(27,934)	(30,474)
Cash and Cash Equivalents at Beginning of Period		225,743	176,143
Cash and Cash Equivalents at End of Period		197,809	145,669
Supplemental Cash Flow Information
Cash payments (refunds) of income taxes, net of payments/refunds		5,603	(733)
Cash payments of interest		$ 2,164	$ 2,124

[1] The 2016 amounts for the noted line items have been immaterially changed from the amounts originally reported as a result of the Company’s fourth quarter 2016 adoption of Accounting Standards Update (ASU) No. 2019-9, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.

[2] Amounts for the noted line items have been immaterially changed from the amounts originally reported as a result of the Company’s fourth quarter 2016 adoption of ASU No. 2016-9, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.

[3] The amounts for the first quarter of 2016 have been immaterially changed from the originally reported amounts as a result of the Company’s fourth quarter 2016 adoption of ASU No. 2019-9, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting