Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities
Net earnings	$ 164,790	$ 346,537	$ (19,560)
Adjustments to reconcile net earnings (loss) to net cash provided by operating activities:
Depreciation and amortization	164,461	161,863	163,146
(Gain) loss on disposal of property and equipment	(157)	(2,216)	(265)
Accretion of interest on convertible debt instruments	14,146	10,769	4,984
Inventory write-offs for obsolescence	26,494	23,872	17,771
Pensions and other postretirement benefits, net of contributions	(552)	(1,549)	(2,425)
Loss on disposal of equity affiliate	0	0	6,112
Loss on early extinguishment of debt	2,030	26,583	0
Deferred income taxes	(23,009)	(55,206)	52,377
Other	13,341	21,194	13,044
Change in U.S. transition tax liability	(14,757)	(14,757)	180,000
Change in repatriation tax liability	(38,814)	(156,767)	0
Net change in operating assets and liabilities, net of effects of businesses acquired	(11,529)	(101,817)	(46,407)
Net cash provided by operating activities	296,444	258,506	368,777
Investing activities
Capital expenditures	(156,641)	(229,899)	(170,432)
Proceeds from sale of property and equipment	577	55,561	1,685
Purchase of businesses, net of cash acquired	(11,862)	(14,880)	0
Purchase of short-term investments	(111,631)	(175,403)	(749,600)
Maturity of short-term investments	81,012	636,108	887,729
Other investing activities	3,587	(2,058)	(4,189)
Net cash provided by (used in) investing activities	(194,958)	269,429	(34,807)
Financing activities
Proceeds from long-term borrowings	0	600,000	0
Issuance costs	(5,394)	(15,621)	0
Repurchase of convertible debentures	(27,863)	(960,995)	0
Net proceeds (payments) on revolving credit lines	0	(150,000)	7,000
Common stock repurchases	0	0	(39,944)
Net changes in short-term borrowings	(16)	15	1
Distributions to noncontrolling interests	(600)	(525)	(1,140)
Acquisition of noncontrolling interests	0	0	(4,100)
Proceeds from stock options exercised	0	0	1,260
Cash withholding taxes paid when shares withheld for vested equity awards	(2,708)	(2,297)	(1,971)
Other financing activities	0	0	(1,255)
Net cash used in financing activities	(90,025)	(575,932)	(77,198)
Effect of exchange rate changes on cash and cash equivalents	(3,360)	(14,003)	19,479
Net increase (decrease) in cash and cash equivalents	8,101	(62,000)	276,251
Cash and cash equivalents at beginning of year	686,032	748,032	471,781
Cash and cash equivalents at end of year	694,133	686,032	748,032
Common Stock [Member]
Operating activities
Net earnings	0	0	0
Financing activities
Dividends and Interest Paid	(48,968)	(42,608)	(33,956)
Class B Convertible Common Stock [Member]
Operating activities
Net earnings	0	0	0
Financing activities
Dividends and Interest Paid	$ (4,476)	$ (3,901)	$ (3,093)