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Goodwill and Other Intangible Assets
3 Months Ended
Mar. 31, 2015
Goodwill and Other Intangible Assets [Abstract]  
Goodwill and Other Intangible Assets
(4)
Goodwill and Other Intangible Assets
 
Goodwill
 
Changes in the carrying amount of goodwill for the three months ended March 31, 2015, are as follows:

 
 
Total
  
Merge
Healthcare
  
Merge
DNA
 
 
 
  
  
 
Balance at December 31, 2014
 
$
214,374
  
$
194,115
  
$
20,259
 
Increase due to DR Systems acquisition
  
52,889
   
52,889
   
-
 
Balance at March 31, 2015
 
$
267,263
  
$
247,004
  
$
20,259
 
 
Other Intangible Assets
 
The following is a summary of intangible assets subject to amortization:

    
March 31, 2015
  
December 31, 2014
 
  
Weighted Average
Remaining Amortization
Period (Years)
  
Gross
Carrying
Amount
  
Accumulated
Amortization
  
Gross
Carrying
Amount
  
Accumulated
Amortization
 
Purchased software and technology
  
7.9
  
$
61,137
  
$
22,872
  
$
32,497
  
$
21,706
 
Capitalized software
  
4.5
   
6,244
   
2,261
   
5,852
   
2,058
 
Customer relationships
  
8.5
   
61,284
   
28,836
   
43,664
   
27,440
 
Backlog
  
0.0
   
8,100
   
8,100
   
8,100
   
8,100
 
Trade names
  
4.6
   
1,883
   
821
   
1,463
   
764
 
Non-competes
  
2.5
   
3,379
   
2,183
   
3,099
   
2,066
 
Total
     
$
142,027
  
$
65,073
  
$
94,675
  
$
62,134
 
 
Estimated aggregate amortization expense for our intangible assets, which are expected to become fully amortized in 2027, is as follows:

For the remaining nine months of the year ending December 31:
2015
 
$
11,061
 
For the year ending December 31:
2016
  
13,392
 
 2017
  
11,068
 
 2018
  
8,806
 
 2019
  
6,914
 
Thereafter
  
25,713
 
Total
 
$
76,954
 

In the three months ended March 31, 2015, we increased the gross carrying amount of purchased software and technology, customer relationships, trades names, and non-competes by $28,640, $17,620, $420 and $280, respectively, in conjunction with the acquisition of DR Systems. For the three months ended March 31, 2015, we also added $393 in capitalized software.

Amortization expense is set forth in the following table:

  
Three Months Ended
March 31,
 
  
2015
  
2014
 
Amortization included in cost of sales:
 
  
 
Purchased software and technology
 
$
1,166
  
$
1,258
 
Capitalized software
  
204
   
43
 
Backlog
  
-
   
58
 
Subtotal
  
1,370
   
1,359
 
         
Amortization included in operating expenses:
        
Customer relationships
  
1,396
   
1,758
 
Trade names
  
57
   
40
 
Non-competes
  
116
   
115
 
Subtotal
  
1,569
   
1,913
 
Total amortization
 
$
2,939
  
$
3,272