Consolidated Condensed Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jul. 04, 2020	Jun. 29, 2019
Operating activities
Net earnings	$ 52,279	$ 120,376
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	82,158	81,346
(Gain) loss on disposal of property and equipment	(43)	(162)
Accretion of interest on convertible debt instruments	7,125	6,985
Inventory write-offs for obsolescence	11,587	12,643
Deferred income taxes	(4,370)	(5,601)
Loss on extinguishment of debt	4,066	1,307
Other	954	4,283
Change in U.S. transition tax liability	0	(14,757)
Change in repatriation tax liability	(16,258)	(20,479)
Net change in operating assets and liabilities, net of effects of businesses acquired	(12,589)	(50,122)
Net cash provided by operating activities	124,909	135,819
Investing activities
Capital expenditures	(48,832)	(70,148)
Proceeds from sale of property and equipment	230	464
Purchase of businesses, net of cash received	0	(11,862)
Purchase of short-term investments	(157,086)	(1,970)
Maturity of short-term investments	108,044	79,694
Other investing activities	(529)	2,893
Net cash provided by (used in) investing activities	(98,173)	(929)
Financing activities
Issuance costs	0	(5,394)
Repurchase of convertible debt instruments	(90,525)	(22,695)
Net proceeds (payments) on revolving credit lines	0	28,000
Net changes in short-term borrowings	(113)	22
Distributions to noncontrolling interests	(600)	(600)
Cash withholding taxes paid when shares withheld for vested equity awards	(2,016)	(2,708)
Net cash provided by (used in) financing activities	(120,738)	(29,375)
Effect of exchange rate changes on cash and cash equivalents	(201)	(641)
Net increase (decrease) in cash and cash equivalents	(94,203)	104,874
Cash and cash equivalents at beginning of period	694,133	686,032
Cash and cash equivalents at end of period	599,930	790,906
Common Stock [Member]
Financing activities
Dividends paid to common stockholders	(25,185)	(23,822)
Class B Convertible Common Stock [Member]
Financing activities
Dividends paid to common stockholders	$ (2,299)	$ (2,178)