Consolidated Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Operating activities
Net earnings	$ 62,545	$ 36,949
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	40,558	40,212
(Gain) loss on disposal of property and equipment	(176)	60
Accretion of interest on convertible debentures	1,309	1,211
Inventory write-offs for obsolescence	5,457	4,834
Deferred income taxes	7,014	4,307
Non-cash loss on disposal of equity affiliate	0	7,060
Other	2,908	2,026
Net change in operating assets and liabilities, net of effects of businesses acquired	(72,756)	(52,985)
Net cash provided by operating activities	46,859	43,674
Investing activities
Capital expenditures	(28,273)	(16,668)
Proceeds from sale of property and equipment	184	943
Purchase of businesses, net of cash acquired	(12,072)	0
Purchase of short-term investments	(39,243)	(151,886)
Maturity of short-term investments	93,194	147,530
Other investing activities	(935)	(5,971)
Net cash provided by (used in) investing activities	12,855	(26,052)
Financing activities
Net proceeds (payments) on revolving credit lines	34,000	20,000
Net changes in short-term borrowings	52	8
Cash withholding taxes paid when shares withheld for vested equity awards	(2,297)	(1,971)
Other financing activities	0	(1,255)
Net cash provided by (used in) financing activities	22,020	7,646
Effect of exchange rate changes on cash and cash equivalents	9,825	2,337
Net increase (decrease) in cash and cash equivalents	91,559	27,605
Cash and cash equivalents at beginning of period	748,032	471,781
Cash and cash equivalents at end of period	839,591	499,386
Common Stock [Member]
Financing activities
Dividends and Interest Paid	(8,918)	(8,378)
Class B Convertible Common Stock [Member]
Financing activities
Dividends and Interest Paid	$ (817)	$ (758)