CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 43,481	$ 39,208
Adjustments to reconcile net earnings to net cash used in operating activities:
Depreciation and amortization	14,863	14,992
Loss from equity method investment	733	963
Amortization of marketable security premiums	2,274	1,318
Changes in operating assets and liabilities:
Accounts receivable	(60,765)	(69,113)
Other receivables	2,315	(3,508)
Inventories	(7,141)	6,696
Prepaid expenses and other assets	28,193	7,009
Accounts payable and accrued liabilities	10,301	13,906
Income taxes payable and deferred	5,124	7,272
Postretirement health care and life insurance benefits	2,575	2,254
Deferred compensation and other liabilities	2,801	2,403
Other	(175)	715
Net cash from operating activities	44,579	24,115
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(10,593)	(7,008)
Net purchases of trading securities	(2,612)	(2,489)
Purchase of available for sale securities	(63,992)	(33,502)
Sale and maturity of available for sale securities	22,436	5,743
Net cash used in investing activities	(54,761)	(37,256)
CASH FLOWS FROM FINANCING ACTIVITIES:
Shares purchased and retired	(11,429)	(14,363)
Dividends paid in cash	(9,517)	(13,984)
Net cash used in financing activities	(20,946)	(28,347)
Decrease in cash and cash equivalents	(31,128)	(41,488)
Cash and cash equivalents at beginning of year	63,862	78,612
Cash and cash equivalents at end of quarter	32,734	37,124
Supplemental cash flow information:
Income taxes paid, net	13,173	10,651
Interest paid	19	27
Stock dividend issued	$ 48,925	$ 38,237