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Goodwill and Other Intangible Assets
9 Months Ended
Sep. 30, 2016
Goodwill and Other Intangible Assets [Abstract]  
Goodwill and Other Intangible Assets
7.
Goodwill and Other Intangible Assets

The carrying value of goodwill by segment was as follows (in thousands):
 
 
 
Medical &
Scientific Imaging
  
RF Technology
  
Industrial
Technology
  
Energy Systems
& Controls
  
Total
 
Balances at December 31, 2015
 
$
3,039,197
  
$
1,993,299
  
$
374,033
  
$
418,197
  
$
5,824,726
 
Goodwill acquired
  
164,666
   
-
   
-
   
-
   
164,666
 
Other
  
(977
)
  
2,428
   
-
   
-
   
1,451
 
Currency translation adjustments
  
(5,517
)
  
(10,086
)
  
(2,539
)
  
(3,373
)
  
(21,515
)
Balances at September 30, 2016
 
$
3,197,369
  
$
1,985,641
  
$
371,494
  
$
414,824
  
$
5,969,328
 

Other relates primarily to tax purchase accounting and working capital adjustments for 2015 acquisitions.

Other intangible assets were comprised of (in thousands):
 
 
 
Cost
  
Accumulated
amortization
  
Net book
value
 
Assets subject to amortization:
         
Customer related intangibles
 
$
2,448,509
  
$
(602,615
)
 
$
1,845,894
 
Unpatented technology
  
270,170
   
(117,405
)
  
152,765
 
Software
  
161,201
   
(44,298
)
  
116,903
 
Patents and other protective rights
  
24,160
   
(18,659
)
  
5,501
 
Backlog
  
700
   
(700
)
  
-
 
Trade names
  
595
   
(122
)
  
473
 
Assets not subject to amortization:
            
Trade names
  
407,460
   
-
   
407,460
 
Balances at December 31, 2015
 
$
3,312,795
  
$
(783,799
)
 
$
2,528,996
 
Assets subject to amortization:
            
Customer related intangibles
 
$
2,526,659
  
$
(689,813
)
 
$
1,836,846
 
Unpatented technology
  
296,238
   
(136,128
)
  
160,110
 
Software
  
174,399
   
(50,803
)
  
123,596
 
Patents and other protective rights
  
23,840
   
(19,965
)
  
3,875
 
Trade names
  
6,621
   
(396
)
  
6,225
 
Assets not subject to amortization:
            
Trade names
  
410,830
   
-
   
410,830
 
Balances at September 30, 2016
 
$
3,438,587
  
$
(897,105
)
 
$
2,541,482
 

Amortization expense of other intangible assets was $147,773 and $118,119 during the nine months ended September 30, 2016 and 2015, respectively.
 
An evaluation of the carrying value of goodwill and indefinite-lived intangibles is required to be performed on an annual basis and on an interim basis if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying value. There have been no events or changes in circumstances which indicate an interim impairment review is required in 2016. The Company expects to perform the annual analysis during the fourth quarter.