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Fair Value Measurements of Assets and Liabilities (Tables)
 3 Months Ended
Apr. 01, 2012
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
Following are the disclosures related to the fair value of our financial assets and (liabilities) (in thousands):
April 1, 2012
Level 1
Level 2
Level 3
Total
Available for sale marketable securities:
 
 
 
 
U.S. treasury notes
$
15,022

$
—

$
—

$
15,022

Agency bonds
—

58,004

—

58,004

Commercial paper
—

14,996

—

14,996

Certificates of deposit
—

2,051

—

2,051

Trading securities:
 
 
 
 
Equity securities – mutual funds
2,998

—

—

2,998

Derivative contracts, net
—

586

—

586

Total
$
18,020

$
75,637

$
—

$
93,657

December 31, 2011
Level 1
Level 2
Level 3
Total
Available for sale marketable securities:
 
 
 
 
Agency bonds
$
—

$
58,533

$
—

$
58,533

Commercial paper
—

5,000

—

5,000

Certificates of deposit
—

3,211

—

3,211

Trading securities:
 
 
 
 
Equity securities – mutual funds
2,810

—

—

2,810

Derivative contracts, net
—

(13,967
)
—

(13,967
)
Total
$
2,810

$
52,777

$
—

$
55,587
Schedule of Fair Value Convertible Debt Outstanding
Our fixed rate convertible debt outstanding was as follows (in thousands):
 
April 1,
2012
Fixed rate convertible debt on balance sheet
$
89,011

Fair value of fixed rate convertible debt
152,219