| Changes in the carrying amount of goodwill by segment |
Changes in the carrying amount of goodwill for the years ended December 31, 2018 and 2017, by segment, were as follows, in thousands:
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|
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Gross Goodwill
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Gross Goodwill
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Accumulated
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Net Goodwill
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|
|
at
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|
|
|
at
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Impairment
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|
at
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|
|
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December 31, 2017
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Additions
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|
December 31, 2018
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Losses
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|
December 31, 2018
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Goodwill, by segment:
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|
|
|
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|
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|
|
|
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Installation
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|
$
|
1,422,920
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|
$
|
256,734
|
|
$
|
1,679,654
|
|
$
|
(762,021)
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|
$
|
917,633
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Distribution
|
|
|
416,287
|
|
|
30,096
|
|
|
446,383
|
|
|
—
|
|
|
446,383
|
|
Total goodwill
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|
$
|
1,839,207
|
|
$
|
286,830
|
|
$
|
2,126,037
|
|
$
|
(762,021)
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|
$
|
1,364,016
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Gross Goodwill
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|
|
|
Gross Goodwill
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|
Accumulated
|
|
Net Goodwill
|
|
|
|
at
|
|
|
|
at
|
|
Impairment
|
|
at
|
|
|
|
December 31, 2016
|
|
Additions
|
|
December 31, 2017
|
|
Losses
|
|
December 31, 2017
|
|
Goodwill, by segment:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Installation
|
|
$
|
1,390,792
|
|
$
|
32,128
|
|
$
|
1,422,920
|
|
$
|
(762,021)
|
|
$
|
660,899
|
|
Distribution
|
|
|
416,287
|
|
|
—
|
|
|
416,287
|
|
|
—
|
|
|
416,287
|
|
Total goodwill
|
|
$
|
1,807,079
|
|
$
|
32,128
|
|
$
|
1,839,207
|
|
$
|
(762,021)
|
|
$
|
1,077,186
|
|
| Schedule of other intangible assets |
The following table sets forth our other intangible assets and associated amortization expense, in thousands:
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As of
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|
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December 31,
|
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December 31,
|
|
December 31,
|
|
|
|
2018
|
|
2017
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|
2016
|
|
Gross definite-lived intangible assets
|
|
$
|
218,882
|
|
$
|
54,872
|
|
$
|
20,932
|
|
Accumulated amortization
|
|
|
(19,495)
|
|
|
(21,629)
|
|
|
(18,683)
|
|
Net definite-lived intangible assets
|
|
|
199,387
|
|
|
33,243
|
|
|
2,249
|
|
Indefinite-lived intangible assets not subject to amortization
|
|
|
—
|
|
|
—
|
|
|
407
|
|
Other intangible assets, net
|
|
$
|
199,387
|
|
$
|
33,243
|
|
$
|
2,656
|
|
|
|
|
|
|
|
|
|
|
|
|
Amortization expense
|
|
$
|
15,752
|
|
$
|
2,994
|
|
$
|
795
|
|