Investments (Tables)

3 Months Ended

Mar. 30, 2013

Investments

Summary of the amortized cost and estimated fair value of short-term investments for both available-for-sale and trading securities

	2013				2012
	Amortized		Fair		Amortized		Fair
(Thousands of dollars)	Cost		Value		Cost		Value
Money market funds	$	138,756	$	138,756	$	126,537	$	126,537
Corporate bonds	65,071		66,661		67,275		69,214
Enhanced cash mutual fund	25,000		25,011		-		-
U.S. Government agency securities	22,276		22,336		23,647		23,775
U.S. Treasury securities	20,821		20,855		17,165		17,169
Emerging markets debt mutual fund	17,693		18,750		17,693		18,734
Collateralized mortgage obligations	14,622		14,716		15,059		15,162
Asset backed debt securities	12,485		12,544		12,180		12,238
Total available-for-sale short-term investments	316,724		319,629		279,556		282,829
High yield trading debt securities	22,604		24,190		21,839		23,406
Emerging markets trading debt mutual fund	3,079		3,237		3,046		3,237
Emerging markets trading debt securities	2,563		2,761		2,361		2,600
Other trading investments	935		985		1,262		1,307
Total available-for-sale and trading short-term investments	$	345,905	$	350,802	$	308,064	$	313,379

Summary of estimated fair value of fixed rate securities designated as available-for-sale, classified by the contractual maturity date of the security

(Thousands of dollars)	2013
Due within one year	$	4,254
Due after one year through three years	42,457
Due after three years	63,702
Total fixed rate securities	$	110,413