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Intangible Assets
9 Months Ended
Sep. 30, 2011
Goodwill and Intangible Assets [Abstract] 
INTANGIBLE ASSETS

4. INTANGIBLE ASSETS

 Amortizing intangible assets are comprised of the following (in thousands):
              
 AtSeptember 30, 2011 Gross Carrying Amount  Accumulated Amortization  Foreign Currency Translation  Net Carrying Amount
 Purchased technology and patents$ 89,273 $ (52,979) $ 1,745 $ 38,039
 Customer lists  46,818   (13,172)   2,327   35,973
 Other  3,519   (3,179)   61   401
 Total amortizing intangible assets$ 139,610 $ (69,330) $ 4,133 $ 74,413
              
 AtDecember 31, 2010           
 Purchased technology and patents$ 83,023 $ (48,187) $ 1,212 $ 36,048
 Customer lists  46,818   (10,577)   2,119   38,360
 Other  3,519   (2,862)   49   706
 Total amortizing intangible assets$ 133,360 $ (61,626) $ 3,380 $ 75,114

Aggregate amortization expense for the third quarter of 2011 and 2010 was $2.7 million and $2.4 million, respectively. Aggregate amortization expense for the nine months ended September 30, 2011 and October 1, 2010 was $7.7 million and $7.2 million, respectively. As of September 30, 2011, annual amortization expense is estimated to be $2.6 million for the remainder of 2011, $10.3 million for 2012, $9.5 million for 2013, $8.8 million for 2014 and $7.7 million for 2015. During 2011, the Company purchased technology and patents totaling $6.4 million, which is being amortized over a weighted average period of approximately 11 years. In connection with these purchases, the Company recorded a $3.0 million contingent liability, which will only be paid if certain sales targets for products that utilize that technology are achieved. This contingent liability is currently classified in Other Long-Term Liabilities.

 The change in goodwill is as follows (in thousands):
           
    Greatbatch Medical  Electrochem  Total
 AtDecember 31, 2010$ 297,508 $ 9,943 $ 307,451
 Foreign currency translation  1,106  0   1,106
 AtSeptember 30, 2011$ 298,614 $ 9,943 $ 308,557