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Goodwill and Intangible Assets
12 Months Ended
Dec. 31, 2016
Goodwill and Other Intangible Assets [Abstract]  
Goodwill and Intangible Assets
Note 3. Goodwill and Other Intangible Assets

The goodwill balance was $14.9 million as of December 31, 2016 and 2015.  Goodwill is subject to annual impairment tests and if triggering events are present before the annual tests, we will assess impairment. As of December 31, 2016, no impairment charges were taken.

Other intangible assets consist primarily of customer relationship enhancements. Other intangible assets were amortized on a straight-line basis over their estimated useful lives of 5 years. The amortization was based on a forecast of approximately equal annual customer orders over the 5-year period. Amortization expense for 2016, 2015 and 2014 was $1.1 million, $2.3 million, and $2.3 million, respectively. The other intangible assets were fully amortized as of June 30, 2016.
Other intangible assets consist of the following:
  
December 31, 2016
  
December 31, 2015
 
  
Cost
  
Accumulated Amortization
  
Cost
  
Accumulated Amortization
 
Other intangible assets
 
$
11,286
  
$
11,286
  
$
11,286
  
$
10,157
 
  
$
11,286
  
$
11,286
  
$
11,286
  
$
10,157