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Investments (Tables)

6 Months Ended

Jul. 04, 2015

Investments, Debt and Equity Securities [Abstract]

The following table summarizes our investments:



	July 4, 2015								December 31, 2014
	Amortized Cost		Accumulated Other Comprehensive Income				Estimated Fair Value		Amortized Cost		Accumulated Other Comprehensive Income				Estimated Fair Value
Available-for-sale securities (in thousands)	Amortized Cost		Gains		Losses		Estimated Fair Value		Amortized Cost		Gains		Losses		Estimated Fair Value
Commercial paper	$	9,997	$	—	$	—	$	9,997	$	9,998	$	—	$	—	$	9,998
Money market funds	14,794		—		—		14,794		26,456		—		—		26,456
U.S. treasury bills and notes	24,954		3		6		24,951		3,918		1		—		3,919
Securities and obligations of U.S. government agencies	178,813		28		104		178,737		187,947		4		126		187,825
Total	$	228,558	$	31	$	110	$	228,479	$	228,319	$	5	$	126	$	228,198

Fair Value, by Balance Sheet Grouping

The following table identifies the balance sheet classifications of our investments:



(In thousands)	July 4, 2015		December 31, 2014
Cash equivalents	$	18,792	$	26,456
Short-term investments	209,687		201,742
Investments, at estimated fair value	$	228,479	$	228,198

Investments Classified by Contractual Maturity Date

The gross amortized cost and estimated fair value of our investments at July 4, 2015 and December 31, 2014, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.



	July 4, 2015				December 31, 2014
(In thousands)	Gross Amortized Cost		Fair Value		Gross Amortized Cost		Fair Value
Due in one year or less	$	198,558	$	198,512	$	183,317	$	183,234
Due after one year through five years	30,000		29,967		45,002		44,964
Total	$	228,558	$	228,479	$	228,319	$	228,198

Schedule of Temporary Impairment Losses, Investments

The following table provides the breakdown of the cash equivalents and investments with unrealized losses at July 4, 2015:



	In Loss Position for Less Than 12 Months				Total
(In thousands)	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
U.S. treasury bills and notes	$	9,974	$	6	$	9,974	$	6
Securities and obligations of U.S. government agencies	50,775		104		50,775		104
Total	$	60,749	$	110	$	60,749	$	110

The following table provides the breakdown of the cash equivalents and investments with unrealized losses at December 31, 2014:



	In Loss Position for Less Than 12 Months				Total
(In thousands)	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Securities and obligations of U.S. government agencies	$	152,784	$	126	$	152,784	$	126
Total	$	152,784	$	126	$	152,784	$	126

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details