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Goodwill and Other Intangible Assets
12 Months Ended
Dec. 31, 2016
Goodwill and Other Intangible Assets [Abstract]  
Goodwill and Other Intangible Assets
Note 10.
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 $778.7 million and $781.2 million as of December 31, 2016 and December 31, 2015, respectively.  The net change in goodwill since December 31, 2015 was attributable to the effects of foreign exchange.
 
The balance of goodwill by segment and the activity occurring in the past two fiscal years is as follows:
 
  
Specialty
Minerals
  
Refractories
  
Performance
Materials
  
Construction
Technologies
  
Consolidated
 
  
(millions of dollars)
 
Balance at December 31, 2014
 
$
13.7
  
$
49.0
  
$
453.2
  
$
255.0
  
$
770.9
 
                     
Change in goodwill relating to:
                    
Purchase price finalization
          
91.1
   
(78.3
)
  
12.8
 
Foreign exchange translation
  
(0.4
)
  
(2.0
)
  
(0.1
)
  
-
   
(2.5
)
Total Changes
 
$
(0.4
)
 
$
(2.0
)
 
$
91.0
  
$
(78.3
)
 
$
10.3
 
                     
Balance at December 31, 2015
 
$
13.3
  
$
47.0
  
$
544.2
  
$
176.7
  
$
781.2
 
                     
Change in goodwill relating to:
                    
Purchase price finalization
  
-
   
-
   
-
   
-
   
-
 
Foreign exchange translation
  
(1.2
)
  
(1.3
)
  
-
   
-
   
(2.5
)
Total Changes
  
(1.2
)
  
(1.3
)
  
-
   
-
   
(2.5
)
                     
Balance at December 31, 2016
 
$
12.1
  
$
45.7
  
$
544.2
  
$
176.7
  
$
778.7
 
 
Acquired intangible assets subject to amortization as of December 31, 2016 and December 31, 2015 were as follows:

     
Weighted
Average
Useful Life
(Years)
  
December 31, 2016
  
December 31, 2015
 
      
Gross
Carrying
Amount
       
Accumulated
Amortization
      
Gross
Carrying
Amount
       
Accumulated
Amortization
 
 
 
     
(millions of dollars)
 
Tradenames
  
34
  
$
199.8
  
$
15.3
  
$
199.8
  
$
9.3
 
Technology
  
12
   
18.8
   
3.6
   
18.8
   
2.5
 
Patents and trademarks
  
17
   
6.4
   
4.8
   
6.4
   
4.4
 
Customer relationships
  
30
   
4.5
   
1.4
   
4.5
   
0.6
 
   
28
  
$
229.5
  
$
25.1
  
$
229.5
  
$
16.8
 

 The weighted average amortization period of the acquired intangible assets subject to amortization is approximately 28 years.  Amortization expense was approximately $8.2 million, $7.9 million and $4.6 million for the years ended December 31, 2016, 2015 and 2014, respectively and is recorded within the Marketing and administrative expenses line within the Consolidated Statements of Income.  The estimated amortization expense is $7.9 million annually for 2017-2021, and $164.9 million thereafter.