Consolidated Condensed Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013
Operating activities
Net earnings	$ 61,796	$ 60,626
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	86,931	83,456
(Gain) loss on disposal of property and equipment	23	86
Accretion of interest on convertible debentures	1,933	1,787
Inventory write-offs for obsolescence	9,867	9,479
Other	1,312	(3,929)
Net change in operating assets and liabilities, net of effects of businesses acquired	(62,789)	(57,437)
Net cash provided by operating activities	99,073	94,068
Investing activities
Capital expenditures	(53,336)	(47,173)
Proceeds from sale of property and equipment	1,741	3,252
Purchase of businesses, net of cash acquired	(20,776)	(23,034)
Purchase of short-term investments	(243,975)	(361,940)
Maturity of short-term investments	236,624	190,602
Other investing activities	927	934
Net cash provided by (used in) investing activities	(78,795)	(237,359)
Financing activities
Principal payments on long-term debt and capital leases	(11)	(14)
Net proceeds (payments) on revolving credit lines	20,000	11,000
Net changes in short-term borrowings	16	698
Excess tax benefit from RSUs vested	0	456
Distributions to noncontrolling interests	(547)	0
Net cash provided by (used in) financing activities	1,764	12,140
Effect of exchange rate changes on cash and cash equivalents	(2,797)	(5,245)
Net increase (decrease) in cash and cash equivalents	19,245	(136,396)
Cash and cash equivalents at beginning of period	640,348	697,595
Cash and cash equivalents at end of period	659,593	561,199
Common Stock [Member]
Financing activities
Dividends and Interest Paid	(16,238)	0
Class B Convertible Common Stock [Member]
Financing activities
Dividends and Interest Paid	$ (1,456)	$ 0