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Acquired Intangible Assets
 6 Months Ended
Jun. 30, 2012
Acquired Intangible Assets [Abstract]  
Acquired Intangible Assets [Text Block]
Note 7.
Acquired Intangible Assets

Acquired identifiable intangible assets consist of the following:

 
 
June 30,
2012
  
December 31,
2011
 
   
(In thousands)
 
        
Customer relationships
 $40,100  $32,100 
Trademarks and trade names
  6,800   6,300 
Non-compete agreements
  910   700 
Patents and supply contracts
  723   723 
Leaseholds
  160   - 
Total acquired intangible assets
  48,693   39,823 
Less accumulated amortization (1)
  (11,597)  (9,467)
Net acquired intangible assets
 $37,096  $30,356 

(1)
Applies to all intangible assets, except for the Dana acquisition related trademarks and trade names totaling $5.2 million, which have indefinite useful lives and, as such, are not being amortized.

In April 2012, we acquired substantially all of the assets of CompressorWorks, Inc.  Intangible assets of $8.9 million were acquired in the acquisition consisting of customer relationships of $8 million that will be amortized on a straight-line basis over the estimated useful life of 7 years; trademarks and trade names of $0.5 million that will be amortized on a straight-line basis over the estimated useful life of 3 years; non-compete agreements of $0.2 million that will be amortized on a straight-line basis over the estimated useful life of 3 years; and leaseholds of $0.2 million that will be amortized on a straight-line basis over the estimated useful life of 2.3 years.
 
Total amortization expense for acquired intangible assets was $1.2 million and $2.1 million for three months and six months ended June 30, 2012, respectively, and $0.4 million and $0.8 million for the comparable periods in 2011.  Based on the current estimated useful lives assigned to our acquired intangible assets, amortization expense is estimated to be $2.6 million for the remainder of 2012, $4.7 million in 2013, $4.1 million in 2014 and $20.5 million in the aggregate for the years 2015 through 2021.