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Goodwill and Other Intangible Assets
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets

The carrying value of goodwill by segment was as follows (in thousands):
 
RF Technology
 
Medical &
Scientific Imaging
 
Industrial Technology
 
Energy Systems
& Controls
 
Total
Balances at December 31, 2015
$
1,993,299

 
$
3,039,197

 
$
374,033

 
$
418,197

 
$
5,824,726

Goodwill acquired
2,710,223

 
166,768

 
—

 
—

 
2,876,991

Currency translation adjustments
(15,118
)
 
(19,100
)
 
(10,055
)
 
(7,774
)
 
(52,047
)
Reclassifications and other
(734
)
 
(1,794
)
 
—

 
—

 
(2,528
)
Balances at December 31, 2016
$
4,687,670

 
$
3,185,071

 
$
363,978

 
$
410,423

 
$
8,647,142

Goodwill acquired
63,490

 
—

 
—

 
19,169

 
82,659

Currency translation adjustments
19,337

 
17,582

 
13,540

 
8,395

 
58,854

Reclassifications and other
28,394

 
3,264

 
—

 
—

 
31,658

Balances at December 31, 2017
$
4,798,891

 
$
3,205,917

 
$
377,518

 
$
437,987

 
$
8,820,313



Reclassifications and other during the year ended December 31, 2017 were due primarily to tax adjustments for 2016 acquisitions. See Note 2 for information regarding acquisitions.

Other intangible assets were comprised of (in thousands):
 
Cost
 
Accum. amort.
 
Net book value
Assets subject to amortization:
 
 
 
 
 
Customer related intangibles
$
3,272,081

 
$
(712,718
)
 
$
2,559,363

Unpatented technology
462,152

 
(144,025
)
 
318,127

Software
184,761

 
(56,882
)
 
127,879

Patents and other protective rights
24,656

 
(20,399
)
 
4,257

Trade names
6,591

 
(653
)
 
5,938

 
 

 
 

 
 

Assets not subject to amortization:
 

 
 

 
 

Trade names
578,279

 
—

 
578,279

In process research and development
62,000

 
—

 
62,000

Balances at December 31, 2016
$
4,590,520

 
$
(934,677
)
 
$
3,655,843

 
 
 
 
 
 
Assets subject to amortization:
 

 
 

 
 

Customer related intangibles
$
3,355,232

 
$
(913,680
)
 
$
2,441,552

Unpatented technology
544,046

 
(207,678
)
 
336,368

Software
184,703

 
(84,825
)
 
99,878

Patents and other protective rights
26,090

 
(22,729
)
 
3,361

Trade names
6,635

 
(1,731
)
 
4,904

Assets not subject to amortization:
 

 
 

 
 

Trade names
587,737

 
—

 
587,737

In process research and development
1,418

 
—

 
1,418

Balances at December 31, 2017
$
4,705,861

 
$
(1,230,643
)
 
$
3,475,218



Amortization expense of other intangible assets was $294 million, $201 million, and $164 million during the years ended December 31, 2017, 2016 and 2015, respectively. Amortization expense is expected to be $294 million in 2018, $282 million in 2019, $276 million in 2020, $264 million in 2021 and $260 million in 2022.