Consolidated Statements of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015
Cash Flows From Operating Activities
Net income		$ 75,959	$ 63,161
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		55,196	49,653
Deferred compensation	[1]	12,595	1,228
Realized and unrealized (gains) losses on long-term investments		(720)	293
Stock-based compensation		8,055	2,961
Deferred income taxes		4,169	107
Other non-cash items		2,120	1,867
Changes in assets and liabilities:
Receivables, net		(30,270)	(10,338)
Inventories		(12,485)	(5,515)
Other current assets		(308)	(1,572)
Accounts payable and accrued liabilities		5,142	23,946
Pension liabilities		415	576
Environmental and legal liabilities		498	(1,503)
Deferred revenues		(846)	(1,063)
Excess tax benefit from stock options and awards		(1,828)	(260)
Net Cash Provided By Operating Activities		117,692	123,541
Cash Flows From Investing Activities
Expenditures for property, plant and equipment		(69,761)	(90,328)
Business acquisition (Note 17)			(5,133)
Proceeds from sale of product line (Note14)			3,262
Other, net		(2,788)	(3,578)
Net Cash Used In Investing Activities		(72,549)	(95,777)
Cash Flows From Financing Activities
Term loan			100,000
Revolving debt and bank overdrafts, net		1,014	(23,656)
Other debt repayments		(6,193)	(7,228)
Dividends paid		(12,732)	(12,067)
Company stock repurchased		(2,408)	(2,000)
Stock option exercises		3,290	431
Excess tax benefit from stock options and awards		1,828	260
Other, net		(275)	(673)
Net Cash (Used In) Provided By Financing Activities		(15,476)	55,067
Effect of Exchange Rate Changes on Cash		1,190	(7,589)
Net Increase in Cash and Cash Equivalents		30,857	75,242
Cash and Cash Equivalents at Beginning of Period		176,143	85,215
Cash and Cash Equivalents at End of Period		207,000	160,457
Supplemental Cash Flow Information
Cash payments of income taxes, net of refunds		18,577	12,560
Cash payments of interest		$ 9,592	$ 6,381

[1] For the three and nine months ended September 30, 2015, deferred compensation expense (income) was included in the administrative expense line. The 2015 amounts have been classified separately to conform to the current year presentation.