Cash, Cash Equivalents and Investments (Tables)

6 Months Ended

Jul. 03, 2011

Cash, Cash Equivalents, and Investments [Abstract]

Components of cash, cash equivalents and investments

	July 3,		December 31,
	2011		2010
Cash	$	28,679	$	26,650
Money market instruments		2,452		6,553
Treasury bills		11,545		-
Cash and cash equivalents		42,676		33,203
Treasury bills		12,979		2,494
Municipal bonds		86,029		75,457
Corporate bonds		68,425		34,543
Agency bonds		23,428		15,979
Sovereign bonds		11,151		19,350
Short-term investments		202,012		147,823
Treasury bills		691		-
Municipal bonds		32,674		34,794
Corporate bonds		37,319		36,762
Agency bonds		14,988		21,025
Sovereign bonds		10,380		-
Covered bonds		6,715		3,541
Limited partnership interest (accounted for using cost method)		5,933		5,933
Long-term investments		108,700		102,055
	$	353,388	$	283,081

Summary of available-for-sale investments

			Gross		Gross
	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses		Fair Value
Short-term:
Treasury bills	$	12,979	$	-	$	-	$	12,979
Municipal bonds		85,959		75		(5)		86,029
Corporate bonds		68,528		15		(118)		68,425
Agency bonds		23,442		24		(38)		23,428
Sovereign bonds		11,186		-		(35)		11,151
Long-term:
Treasury bills		690		1		-		691
Municipal bonds		32,549		127		(2)		32,674
Corporate bonds		37,732		-		(413)		37,319
Agency bonds		15,103		1		(116)		14,988
Sovereign bonds		10,387		2		(9)		10,380
Covered bonds		6,755		-		(40)		6,715
	$	305,310	$	245	$	(776)	$	304,779

Gross unrealized losses and fair value for available-for-sale investments

	Unrealized Loss Position For:
	Less than 12 Months				12 Months or Greater				Total
			Unrealized				Unrealized				Unrealized
	Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
Municipal bonds	$	39,174	$	(7)	$	-	$	-	$	39,174	$	(7)
Corporate bonds		84,990		(515)		10,438		(16)		95,428		(531)
Agency bonds		24,993		(149)		1,259		(5)		26,252		(154)
Sovereign bonds		13,144		(23)		2,483		(21)		15,627		(44)
Covered bonds		6,715		(40)		-		-		6,715		(40)
	$	169,016	$	(734)	$	14,180	$	(42)	$	183,196	$	(776)

Effective maturity dates of available-for-sale investments

		<1 Year		1-2 Years		2-3 Years		3-4 Years		Total
Treasury bills	$	12,979	$	691	$	-	$	-	$	13,670
Municipal bonds		86,029		23,889		7,769		1,016		118,703
Corporate bonds		68,425		20,879		16,440		-		105,744
Agency bonds		23,428		11,984		3,004		-		38,416
Sovereign bonds		11,151		4,476		5,904		-		21,531
Covered bonds		-		6,715		-		-		6,715
	$	202,012	$	68,634	$	33,117	$	1,016	$	304,779