Investments (Tables)

9 Months Ended

Sep. 29, 2012

Investments

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

	2012				2011
	Amortized		Fair		Amortized		Fair
(Thousands of dollars)	Cost		Value		Cost		Value
Corporate bonds	$	132,854	$	135,567	$	88,589	$	89,146
Money market funds	84,178		84,178		139,420		139,420
Collateralized mortgage obligations	24,617		24,816		14,915		15,011
Asset backed debt securities	22,071		22,131		3,533		3,533
U.S. Government agency securities	20,881		21,094		9,720		9,757
U.S. Treasury securities	20,981		21,036		4,848		4,905
Fixed rate municipal notes and bonds	20,595		20,631		17,718		17,788
Emerging markets debt mutual fund	17,693		18,109		17,693		16,399
Other	680		683		1,480		1,484
Total available-for-sale short-term investments	344,550		348,245		297,916		297,443
High yield trading debt securities	21,165		22,620		20,155		20,750
Emerging markets trading debt mutual fund	3,005		3,087		2,620		2,487
Emerging markets trading debt securities	2,308		2,483		2,444		2,355
Other trading debt securities	683		772		218		221
Total available-for-sale and trading short-term investments	$	371,711	$	377,207	$	323,353	$	323,256

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)	2012
Due within one year	$	42,673
Due after one year through three years	94,094
Due after three years	60,871
Total fixed rate securities	$	197,638