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Fair Value Measurements (Tables)
 3 Months Ended
Apr. 01, 2017
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The fair value of certain financial assets and liabilities was determined using the following inputs: 
 
Fair Value Measurements at April 1, 2017
(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
$
31,679

 
$
—

 
$
31,679

 
$
—

Money market funds
2,189

 
2,189

 
—

 
—

U.S. treasury bills and notes
10,477

 
10,477

 
—

 
—

Securities and obligations of U.S. government agencies
134,181

 
—

 
134,181

 
—

 
178,526

 
12,666

 
165,860

 
—

Foreign currency derivatives(2)
2

 
—

 
2

 
—

Foreign currency derivatives(3)
(1
)
 
—

 
(1
)
 
—

 
$
178,527

 
$
12,666

 
$
165,861

 
$
—

 
 
 
 
 
 
 
 
 
Fair Value Measurements at December 31, 2016
(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
$
23,684

 
$
—

 
$
23,684

 
$
—

Money market funds
2,266

 
2,266

 
—

 
—

U.S. treasury bills and notes
29,461

 
29,461

 
—

 
—

Securities and obligations of U.S. government agencies
127,704

 
—

 
127,704

 
—

 
183,115

 
31,727

 
151,388

 
—

Foreign currency derivatives(2)
4

 
—

 
4

 
—

Foreign currency derivatives(3)
(4
)
 
—

 
(4
)
 
—

 
$
183,115

 
$
31,727

 
$
151,388

 
$
—

________________ 
(1)
Included in cash and cash equivalents and short-term investments on our condensed consolidated balance sheets. See “Investments” in Note 7 for further details.
(2)
Included in other current assets on our condensed consolidated balance sheets. Consisted of forward foreign exchange contracts for Japanese yen. See “Derivative Instruments and Hedging” in Note 8 for further details.
(3)
Included in other current liabilities on our condensed consolidated balance sheets. Consisted of forward foreign exchange contracts for Japanese yen. See “Derivative Instruments and Hedging” in Note 8 for further details.