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Goodwill and Other Intangible Assets
3 Months Ended
Mar. 30, 2014
Goodwill and Other Intangible Assets [Abstract]  
Goodwill and Other Intangible Assets
Note 7.  Goodwill and Other Intangible Assets

Goodwill and other intangible assets with indefinite lives are not amortized, but instead are assessed for impairment, at least annually. The carrying amount of goodwill was $64.3 million and $64.4 million as of March 30, 2014 and December 31, 2013, respectively.  The net change in goodwill since December 31, 2013 was attributable to the effect of foreign exchange.

Acquired intangible assets subject to amortization included in other assets and deferred charges as of March 30, 2014 and December 31, 2013 were as follows:

 
March 30, 2014
 
 
December 31, 2013
 
(millions of dollars)
 
Gross Carrying Amount
 
 
Accumulated Amortization
 
 
Gross Carrying Amount
 
 
Accumulated Amortization
 
Patents and trademarks
 
$
6.4
 
 
 
3.8
 
 
 
6.4
 
 
 
3.7
 
Customer lists
 
 
2.9
 
 
 
2.7
 
 
 
2.9
 
 
 
2.6
 
 
$
9.3
 
 
 
6.5
 
 
 
9.3
 
 
 
6.3
 

The weighted average amortization period for acquired intangible assets subject to amortization is approximately 15 years. Estimated amortization expense is $0.5 million for 2014, $0.5 million for 2015–2016, $0.3 million for 2017, and $0.1 million for 2018-2019.
 
Included in other assets and deferred charges is an additional intangible asset of approximately $0.5 million which represents the non-current unamortized amount paid to a customer in connection with contract extensions at seven PCC satellite facilities. In addition, a current portion of $0.4 million is included in prepaid expenses and other current assets. Such amounts will be amortized as a reduction of sales over the remaining lives of the customer contracts. Approximately $0.1 million was amortized in the first quarter of 2014. Estimated amortization as a reduction of sales is as follows: remainder of 2014 - $0.3 million; 2015 - $0.1 million.