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Long-Term Debt (Details 1) (USD $) In Thousands	Jul. 02, 2011	Dec. 31, 2010
Embedded derivative	$ (540)	$ (319)
Convertible Senior Debentures Due In 2040
Principal amount of the debentures	275,000	275,000
Unamortized discount	(177,920)	(178,679)
Embedded derivative	327	319
Carrying value of liability component	97,407	96,640
Equity component - net carrying value	110,094	110,094
Convertible Senior Debentures Due In 2041
Principal amount of the debentures	150,000
Unamortized discount	(100,240)
Embedded derivative	213
Carrying value of liability component	49,973	0
Equity component - net carrying value	$ 61,758

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.