Investments (Tables)

6 Months Ended

Jul. 04, 2015

Investments

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

	2015				2014
	Amortized		Fair		Amortized		Fair
(Thousands of dollars)	Cost		Value		Cost		Value
Money market funds	$	266,106	$	266,106	$	142,432	$	142,432
Corporate bonds	12,540		12,538		11,000		11,015
U.S. Government agency securities	9,437		9,480		9,684		9,666
Other available-for-sale investments	3,685		3,706		3,933		3,983
Total available-for-sale short-term investments	291,768		291,830		167,049		167,096
High yield trading debt securities	162,196		159,798		187,491		181,483
Equity mutual fund	86,309		84,557		83,809		82,542
Domestic equity ETF	59,155		61,914		31,307		32,651
Money market funds held in trading accounts	23,618		23,618		21,401		21,401
Other trading investments	5,719		4,820		6,173		5,393
Total trading short-term investments	336,997		334,707		330,181		323,470
Total short-term investments	$	628,765	$	626,537	$	497,230	$	490,566

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)	2015
Due within one year	$	980
Due after one year through three years	9,841
Due after three years	12,542
Total fixed rate securities	$	23,363