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Fair Value Measurements of Assets and Liabilities (Tables)
 6 Months Ended
Jul. 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):
July 1, 2012
Level 1
Level 2
Level 3
Total
Available for sale marketable securities:
 
 
 
 
U.S. treasury notes
$
15,013

$
—

$
—

$
15,013

Agency bonds
—

40,002

—

40,002

Certificates of deposit
—

2,142

—

2,142

Trading securities:
 
 
 
 
Equity securities – mutual funds
2,892

—

—

2,892

Derivative contracts, net
—

(9,326
)
—

(9,326
)
Total
$
17,905

$
32,818

$
—

$
50,723

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):
 
July 1,
2012
Fixed rate convertible debt on balance sheet
$
89,011

Fair value of fixed rate convertible debt
147,486