Consolidated Statement of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Activities
Net income	$ 93,862	$ 67,944	$ 87,927
Depreciation and amortization	35,273	31,684	29,921
Pension expense (Note 14)	6,332	11,955	4,836
Gain on asset dispositions, net	(1,453)	(1,745)	(2,094)
Stock-based compensation (Note 10)	9,211	7,599	9,053
Asset Impairment Charges (Note 15)	0	4,946	0
Deferred income tax provision (Note 9)	14,393	(1,699)	(5,388)
Other noncurrent assets and liabilities	12,546	(41,801)	(49,405)
Currency exchange losses, net	785	2,471	1,393
Excess tax benefit related to stock plans (Note 6)	(478)	(596)	(2,573)
Pension contributions (Note 14)	(3,878)	(4,058)	(4,077)
Other, net	0	(2,786)	(5,168)
Operating cash flow before changes in certain working capital items	166,593	73,914	64,425
Change in trade receivables	13,239	(21,959)	(23,480)
Change in inventories	14,394	(9,403)	(600)
Change in accounts payable and accrued liabilities	(46,479)	20,286	56,988
Change in income taxes receivable, prepaid expenses and other current assets	(12,853)	(7,584)	9,698
Changes in certain working capital items	(31,699)	(18,660)	42,606
Cash Flow From Operating Activities	134,894	55,254	107,031
Investing Activities
Capital expenditures	(25,523)	(36,241)	(33,583)
Property disposals	18,214	8,022	3,385
Acquisition, net of cash acquired (Note 13)	(18,449)	(180,271)	0
Other investing	0	0	(500)
Cash Flow (Used In) Investing Activities	(25,758)	(208,490)	(30,698)
Financing Activities
Proceeds from (payments on) short-term debt, net (Note 11)	0	5	(796)
Payments on long-term debt (Note 11)	(443,572)	(291,525)	(421,667)
Proceeds from long-term debt (Note 11)	382,664	510,456	406,000
Restricted cash	1,505	264	86
Cash dividends paid	(49,074)	(47,380)	(45,586)
Distributions to noncontrolling interests	(1,008)	0	0
Company stock purchases (Note 6)	(1,881)	(9,885)	(5,654)
Exercise of stock options (Note 6)	12,476	1,930	6,926
Employee stock purchase plan (Note 6)	571	488	0
Excess tax benefit related to stock plans (Note 6)	478	596	2,573
Cash Flow (Used In) From Financing Activities	(97,841)	164,949	(58,118)
Effect of exchange rate changes on cash and cash equivalents	(3,461)	(11,786)	(8,482)
Increase (decrease) in cash and cash equivalents	7,834	(73)	9,733
Beginning cash and cash equivalents	105,925	105,998	96,265
Ending cash and cash equivalents	113,759	105,925	105,998
Supplemental cash flow information:
Interest payments	15,861	10,818	9,663
Income tax payments	$ 57,551	$ 50,001	$ 31,679