Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating activities
Net earnings (loss)	$ (19,560)	$ 49,373	$ (107,733)
Adjustments to reconcile net earnings (loss) to net cash provided by operating activities:
Depreciation and amortization	163,146	159,363	176,169
(Gain) loss on disposal of property and equipment	(265)	(4,054)	(86)
Accretion of interest on convertible debentures	4,984	4,610	4,264
Inventory write-offs for obsolescence	17,771	22,619	21,384
Impairment of goodwill and long-lived assets	0	1,559	62,980
U.S. pension settlement charges	0	79,321	0
Pensions and other postretirement benefits, net of contributions	(2,425)	(3,282)	(3,543)
Non-cash loss on disposal of equity affiliate	6,112	0	0
Gain on early extinguishment of debt	0	(4,597)	0
U.S. transition tax (net)	180,000	0	0
Deferred income taxes	52,377	(2,519)	118,447
Other	13,044	(1,678)	1,358
Net change in operating assets and liabilities, net of effects of businesses acquired	(46,407)	(4,206)	(27,249)
Net cash provided by operating activities	368,777	296,509	245,991
Investing activities
Capital expenditures	(170,432)	(134,635)	(147,142)
Proceeds from sale of property and equipment	1,685	5,701	2,049
Purchase and deposits for businesses, net of cash acquired	0	0	(6,750)
Purchase of short-term investments	(749,600)	(555,250)	(486,949)
Maturity of short-term investments	887,729	532,601	345,397
Sale of investments	0	0	503
Sale of other investments	0	0	400
Other investing activities	(4,189)	2,942	(4,884)
Net cash used in investing activities	(34,807)	(148,641)	(297,376)
Financing activities
Debt issuance costs	0	0	(3,693)
Principal payments on long-term debt and capital leases	0	(34,044)	0
Net (payments) proceeds on revolving credit lines	7,000	(47,000)	(10,000)
Common stock repurchases	(39,944)	(23,159)	0
Net changes in short-term borrowings	1	(723)	(14)
Distributions to noncontrolling interests	(1,140)	(707)	(725)
Acquisition of noncontrolling interests	(4,100)	0	0
Proceeds from stock options exercised	1,260	356	0
Cash withholding taxes paid when shares withheld for vested equity awards	(1,971)	(542)	(639)
Other financing activities	(1,255)	0	0
Net cash provided by (used in) financing activities	(77,198)	(142,544)	(50,488)
Effect of exchange rate changes on cash and cash equivalents	19,479	(9,050)	(14,792)
Net decrease in cash and cash equivalents	276,251	(3,726)	(116,665)
Cash and cash equivalents at beginning of year	471,781	475,507	592,172
Cash and cash equivalents at end of year	748,032	471,781	475,507
Common Stock [Member]
Financing activities
Dividends and Interest Paid	(33,956)	(33,693)	(32,506)
Class B Convertible Common Stock [Member]
Financing activities
Dividends and Interest Paid	$ (3,093)	$ (3,032)	$ (2,911)