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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 29, 2014
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The fair value of these certain financial assets and liabilities was determined using the following inputs: 
 
Fair Value Measurements at March 29, 2014
(In thousands)
Total
 
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Available-for-sale securities(1)
 
 
 
 
 
 
 
Commercial paper
$
17,988

 
$
—

 
$
17,988

 
$
—

Money market funds
31,408

 
31,408

 
—

 
—

U.S. treasury bills and notes
6,033

 
6,033

 
—

 
—

Securities and obligations of U.S. government agencies
191,162

 
—

 
191,162

 
—

 
246,591

 
37,441

 
209,150

 
—

Foreign currency derivatives(2)
3

 
—

 
3

 
—

Foreign currency derivatives(3)
(5
)
 
—

 
(5
)
 
—

 
$
246,589

 
$
37,441

 
$
209,148

 
$
—

 
 
 
 
 
 
 
 
 
Fair Value Measurements at December 31, 2013
(In thousands)
Total
 
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Available-for-sale securities(1)
 
 
 
 
 
 
 
Commercial paper
$
3,199

 
$
—

 
$
3,199

 
$
—

Money market funds
42,994

 
42,994

 
—

 
—

U.S. treasury bills and notes
6,072

 
6,072

 
—

 
—

Securities and obligations of U.S. government agencies
194,214

 
—

 
194,214

 
—

 
246,479

 
49,066

 
197,413

 
—

Foreign currency derivatives(2)
12

 
—

 
12

 
—

Foreign currency derivatives(3)
(19
)
 
—

 
(19
)
 
—

 
$
246,472

 
$
49,066

 
$
197,406

 
$
—

________________ 
(1)
Included in cash and cash equivalents and short-term investments on our condensed consolidated balance sheets. See “Investments” in Note 6 for further details.
(2)
Included in other current assets on our condensed consolidated balance sheets. Consisted of forward foreign exchange contracts for the Japanese yen. See “Derivative Instruments and Hedging” in Note 7 for further details.
(3)
Included in other current liabilities on our condensed consolidated balance sheets. Consisted of forward foreign exchange contracts for the Japanese yen. See “Derivative Instruments and Hedging” in Note 7 for further details.