CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 39,208	$ 33,671
Adjustments to reconcile net earnings to net cash used in operating activities:
Depreciation and amortization	14,992	14,465
(Gain) loss from equity method investment	963	(24)
Amortization of marketable security premiums	1,318	893
Changes in operating assets and liabilities:
Accounts receivable	(69,113)	(60,001)
Other receivables	(3,508)	2,692
Inventories	6,696	(26,376)
Prepaid expenses and other assets	7,009	4,571
Accounts payable and accrued liabilities	13,906	11,609
Income taxes payable and deferred	7,272	(145)
Postretirement health care and life insurance benefits	2,254	1,567
Deferred compensation and other liabilities	2,403	1,447
Other	715	(789)
Net cash from (used in) operating activities	24,115	(16,420)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(7,008)	(12,677)
Net purchases of trading securities	(2,489)	(2,967)
Purchase of available-for-sale securities	(33,502)	(38,722)
Sale and maturity of available-for-sale securities	5,743	4,559
Net cash used in investing activities	(37,256)	(49,807)
CASH FLOWS FROM FINANCING ACTIVITIES:
Shares purchased and retired	(14,363)	(10,271)
Dividends paid in cash	(13,984)	(13,788)
Net cash used in financing activities	(28,347)	(24,059)
Decrease in cash and cash equivalents	(41,488)	(90,286)
Cash and cash equivalents at beginning of year	78,612	115,976
Cash and cash equivalents at end of quarter	37,124	25,690
Supplemental cash flow information:
Income taxes paid, net	10,651	9,385
Interest paid	27	33
Stock dividend issued	$ 38,237	$ 47,053