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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2016
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 at December 31, 2016 and 2015:
 
 
 
Fair Value Measurements at December 31, 2016 Using
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

 
$
—

 
 
 
 
 
 
 
 
 
 
 
Fair Value Measurements at December 31, 2015 Using
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
$
9,996

 
$
—

 
$
9,996

 
$
—

Money market funds
9,074

 
9,074

 
—

 
—

U.S. treasury bills and notes
56,872

 
56,872

 
—

 
—

Securities and obligations of U.S. government agencies
128,023

 
—

 
128,023

 
—

 
203,965

 
65,946

 
138,019

 
—

Foreign currency derivatives(2)
43

 
—

 
43

 
—

Foreign currency derivatives(3)
(4
)
 
—

 
(4
)
 
—

 
$
204,004

 
$
65,946

 
$
138,058

 
$
—

___________________
(1)
Included in cash and cash equivalents and short-term investments on our consolidated balance sheet. Cash equivalents at December 31, 2016 and 2015 were $2.3 million and $15.1 million, respectively.
(2)
Included in current assets on our consolidated balance sheet. Consisted of forward foreign exchange contracts for the Japanese yen. See Note 4 - Derivative Instruments and Hedging.
(3)
Included in current liabilities on our consolidated balance sheet. Consisted of forward foreign exchange contracts for the Japanese yen. See Note 4 - Derivative Instruments and Hedging.