Goodwill and Other Intangible Assets

The amounts for goodwill and changes in the carrying value by segment for the

six

months ended

June 30, 2018

are as follows:

(a)

The additions resulted from the acquisition of IXYS.

The components of other intangible assets at

June 30, 2018

are as follows:

(in thousands, except weighted average useful life)	Weighted Average Useful Life		Gross Carrying Value		Accumulated Amortization		Net Book Value
Patents, licenses and software		10.6	$	192,326	$	67,528	$	124,798
Distribution network		12.6		44,001		33,567		10,434
Customer relationships, trademarks, and tradenames		18.1		311,333		63,326		248,007
Order backlog		1.0		12,420		5,607		6,813
Total			$	560,080	$	170,028	$	390,052

During the

six

months ended

June 30, 2018,

the Company recorded additions to other intangible assets of

$212.7

million, related to the IXYS acquisition, the components of which were as follows:

(in thousands, except weighted average useful life)	Weighted Average Useful Life		Amount
Patents, licenses and software		8.0	$	51,500
Customer relationships, trademarks, and tradenames		17.2		148,800
Order backlog		1.0		12,420
Total			$	212,720

During the

three

and

six

months ended

June 30, 2018

and

July 1, 2017,

the Company recorded amortization expense of

$13.4

million and

$6.2

million and

$25.4

million and

$12.1

million, respectively for intangible assets with definite lives.

Estimated annual amortization expense related to intangible assets with definite lives as of

June 30, 2018

is as follows: