Investments (Tables)

9 Months Ended

Sep. 28, 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	$	78,435	$	78,435	$	126,537	$	126,537
Corporate bonds	68,411		69,038		67,275		69,214
U.S. Government agency securities	20,627		20,412		23,647		23,775
Emerging markets debt mutual fund	17,693		17,253		17,693		18,734
Collateralized mortgage obligations	15,058		15,007		15,059		15,162
Asset backed debt securities	8,926		8,967		12,180		12,238
U.S. Treasury securities	5,258		5,237		17,165		17,169
Total available-for-sale short-term investments	214,408		214,349		279,556		282,829
High yield trading debt securities	24,445		25,195		21,839		23,406
Emerging markets trading debt mutual fund	3,161		2,900		3,046		3,237
Emerging markets trading debt securities	1,493		1,535		2,361		2,600
Other trading investments	974		1,016		1,262		1,307
Total available-for-sale and trading short-term investments	$	244,481	$	244,995	$	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	$	658
Due after one year through three years	41,940
Due after three years	57,131
Total fixed rate securities	$	99,729