Consolidated Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
Operating activities
Net earnings	$ 36,949	$ 28,152
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	40,212	40,017
(Gain) loss on disposal of property and equipment	60	(22)
Accretion of interest on convertible debentures	1,211	1,120
Inventory write-offs for obsolescence	4,834	5,816
Non-cash loss on disposal of equity affiliate	7,060	0
Gain on early extinguishment of debt	0	(3,611)
Other	6,333	(13,508)
Net change in operating assets and liabilities, net of effects of businesses acquired	(52,985)	(37,264)
Net cash provided by operating activities	43,674	20,700
Investing activities
Capital expenditures	(16,668)	(19,756)
Proceeds from sale of property and equipment	943	64
Purchase of short-term investments	(151,886)	(24,588)
Maturity of short-term investments	147,530	117,676
Other investing activities	(5,971)	2,975
Net cash provided by (used in) investing activities	(26,052)	76,371
Financing activities
Principal payments on long-term debt and capital leases	0	(22,595)
Net proceeds (payments) on revolving credit lines	20,000	(12,000)
Net changes in short-term borrowings	8	(719)
Cash withholding taxes paid when shares withheld for vested equity awards	(1,971)	(442)
Other financing activities	(1,255)	0
Net cash provided by (used in) financing activities	7,646	(44,987)
Effect of exchange rate changes on cash and cash equivalents	2,337	3,705
Net increase (decrease) in cash and cash equivalents	27,605	55,789
Cash and cash equivalents at beginning of period	471,781	475,507
Cash and cash equivalents at end of period	499,386	531,296
Common Stock [Member]
Financing activities
Dividends and Interest Paid	(8,378)	(8,473)
Class B Convertible Common Stock [Member]
Financing activities
Dividends and Interest Paid	$ (758)	$ (758)