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Convertible Senior Notes (Tables)
 9 Months Ended
Sep. 28, 2013
Debt Disclosure [Abstract]  
Components of Convertible Senior Notes
The Notes consisted of the following (in thousands):
 
 
    Other Non-    
Current
Assets
 
Long-term     
Debt
 
Additional Paid-
in Capital
Principal amount
$
—

 
$
150,000

 
$
—

Debt discount
—

 
(45,000
)
 
—

Equity component
—

 
—

 
45,000

Debt issuance cost
3,872

 
—

 
(1,659
)
Initial transaction amounts
$
3,872

 
$
105,000

 
$
43,341

Amortization of debt issuance cost
(202
)
 
—

 
—

Amortization of debt discount
—

 
2,350

 
—

Net carrying amount at September 28, 2013
$
3,670

 
$
107,350

 
$
43,341
Interest Expense Recognized Related to Notes
The following table sets forth total interest expense recognized related to the Notes (in thousands):
 
 
Three Months Ended
 
Nine Months Ended
 
September 28, 2013
Contractual interest expense
$
656

 
$
875

Amortization of debt issuance costs
152

 
202

Amortization of debt discount
1,770

 
2,350

 
$
2,578

 
$
3,427