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Cash, Cash Equivalents and Investments (Tables)

6 Months Ended

Jul. 01, 2012

Cash, Cash Equivalents, and Investments [Abstract]

Components of cash, cash equivalents and investments


		July 1, 2012				December 31, 2011

Cash		$	25,422			$	36,404
Cash equivalents			134,016				—
Money market instruments			46,554				1,699

Cash and cash equivalents			205,992				38,103


Municipal bonds			39,827				54,036
Corporate bonds			18,162				55,570
Asset-backed securities			1,601				—
Corporate stock			353				—
Agency bonds			—				27,545
Sovereign bonds			—				4,016
Covered bonds			—				1,319
Treasury bills			—				1,945

Short-term investments			59,943				144,431


Municipal bonds			82,866				69,680
Corporate bonds			27,897				59,902
Sovereign bonds			3,882				22,355
Asset-backed securities			3,540				—
Agency bonds			1,001				12,335
Covered bonds			—				4,701
Limited partnership interest (accounted for using cost method)			5,562				5,933

Long-term investments			124,748				174,906

		$	390,683			$	357,440

Summary of available-for-sale investments


		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value

Short-term:
Municipal bonds		$	39,787			$	44			$	(4	)		$	39,827
Corporate bonds			18,123				39				—				18,162
Asset-backed securities			1,600				1				—				1,601

Long-term:
Municipal bonds			82,535				352				(21	)			82,866
Corporate bonds			27,631				266				—				27,897
Sovereign bonds			3,771				111				—				3,882
Asset-backed securities			3,520				20				—				3,540
Agency bonds			1,000				1				—				1,001

		$	177,967			$	834			$	(25	)		$	178,776

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


		Unrealized Loss Position For:
		Less than 12 Months								12 Months or Greater								Total
		Fair Value				Unrealized Losses				Fair Value				Unrealized Losses				Fair Value				Unrealized Losses
Municipal bonds		$	23,739			$	(25	)		$	—			$	—			$	23,739			$	(25	)

Effective maturity dates of available-for-sale investments


		<1 Year				1-2 Years				2-3 Years				3-4 Years				4-5 Years				5-7 Years				Total
Municipal bonds		$	39,827			$	32,506			$	29,458			$	10,100			$	5,680			$	5,122			$	122,693
Corporate bonds			18,162				10,124				14,202				—				3,571				—				46,059
Asset-backed securities			1,601				—				3,037				—				—				503				5,141
Sovereign bonds			—				3,882				—				—				—				—				3,882
Agency bonds			—				1,001				—				—				—				—				1,001

		$	59,590			$	47,513			$	46,697			$	10,100			$	9,251			$	5,625			$	178,776