CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 37,144	$ 27,152
Adjustments to reconcile net earnings to net cash from operating activities:
Depreciation	22,333	22,154
Amortization of intangibles	1,880	2,218
Expense associated with share-based compensation arrangements	1,491	1,078
Excess tax benefits from share-based compensation arrangements	(8)	(73)
Loss reserve for notes receivable	0	767
Deferred income taxes	(83)	(1,223)
Equity in earnings of investee	(152)	(25)
Net gain on sale or impairment of property, plant and equipment	(195)	(7,228)
Changes in:
Accounts receivable	(79,849)	(63,466)
Inventories	11,261	(13,483)
Accounts payable	19,336	22,285
Accrued liabilities and other	34,580	12,343
NET CASH FROM OPERATING ACTIVITIES	47,738	2,499
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(32,108)	(22,187)
Proceeds from sale of property, plant and equipment	1,261	15,092
Acquisitions, net of cash received	(9,296)	(2,149)
Purchase of patents	0	(95)
Advances on notes receivable	(1,990)	(1,157)
Collections on notes receivable	1,441	915
Cash restricted as to use	6,111	(553)
Other, net	28	(387)
NET CASH FROM INVESTING ACTIVITIES	(34,553)	(10,521)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net borrowings (repayments) under revolving credit facilities	(11,090)	6,217
Repayment of long-term debt	0	(2,773)
Debt issuance costs	(15)	(86)
Proceeds from issuance of common stock	839	1,826
Distributions to noncontrolling interest	(1,460)	(871)
Capital contribution from noncontrolling interest	0	281
Dividends paid to shareholders	(3,977)	(3,946)
Excess tax benefits from share-based compensation arrangements	8	73
Other, net	0	4
NET CASH FROM FINANCING ACTIVITIES	(15,695)	725
Effect of exchange rate changes on cash	14	347
NET CHANGE IN CASH AND CASH EQUIVALENTS	(2,496)	(6,950)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	7,647	11,305
CASH (OVERDRAFT), END OF PERIOD	5,151	4,355
SUPPLEMENTAL SCHEDULE OF CASH FLOW INFORMATION:
Interest paid	2,850	2,498
Income taxes paid	6,780	15,797
NON-CASH INVESTING ACTIVITIES [Abstract]
Accounts receivable exchanged for notes receivable	1,635	0
Notes receivable exchanged for property	3,900	0
NON-CASH FINANCING ACTIVITIES:
Common stock issued under deferred compensation plans	$ 1,647	$ 1,161