Consolidated Statements of Cash Flows - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015
Cash Flows From Operating Activities
Net income		$ 55,527	$ 38,227
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		36,453	32,859
Deferred compensation	[1]	5,154	8,150
Realized and unrealized losses (gains) on long-term investments		205	(642)
Stock-based compensation		4,448	3,162
Deferred income taxes		6,146	(1,953)
Other non-cash items		1,165	508
Changes in assets and liabilities:
Receivables, net		(33,586)	(679)
Inventories		(8,664)	(245)
Other current assets		335	(2,438)
Accounts payable and accrued liabilities		8,586	3,386
Pension liabilities		365	358
Environmental and legal liabilities		767	(1,408)
Deferred revenues		(564)	(781)
Excess tax benefit from stock options and awards		(893)	(236)
Net Cash Provided By Operating Activities		75,444	78,268
Cash Flows From Investing Activities
Expenditures for property, plant and equipment		(40,696)	(54,021)
Business acquisition (Note 17)			(5,133)
Proceeds from sale of product line (Note14)			3,262
Other, net		(3,533)	(1,746)
Net Cash Used In Investing Activities		(44,229)	(57,638)
Cash Flows From Financing Activities
Revolving debt and bank overdrafts, net		(3,971)	(9,435)
Other debt repayments		(6,033)	(2,503)
Dividends paid		(8,477)	(8,061)
Company stock repurchased		(2,408)
Stock option exercises		1,351	359
Excess tax benefit from stock options and awards		893	236
Other, net		(235)	(275)
Net Cash Used In Financing Activities		(18,880)	(19,679)
Effect of Exchange Rate Changes on Cash		1,933	(3,801)
Net Increase (Decrease) in Cash and Cash Equivalents		14,268	(2,850)
Cash and Cash Equivalents at Beginning of Period		176,143	85,215
Cash and Cash Equivalents at End of Period		190,411	82,365
Supplemental Cash Flow Information
Cash payments of income taxes, net of refunds		11,074	6,873
Cash payments of interest		$ 7,442	$ 6,046

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