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4. Intangible Assets
The carrying amounts of intangible assets subject to amortization are included within other long-term assets. The gross carrying amounts of intangible assets, the related accumulated amortization, the net carrying amounts and the weighted-
average amortization periods of the Company’s intangible assets are listed in the following tables (in thousands, except amortization period):
|
|
|
|
|
|
|
|
|
|
|
|
|
|
June 30, 2019 |
|
|
|
|
|
|
|
|
|
|
|
Weighted- |
|
|
|
|
|
|
|
|
|
|
Average |
|
|
Gross Carrying |
|
Accumulated |
|
Net Carrying |
|
Amortization |
|
|
Amount |
|
Amortization |
|
Amount |
|
Period (Years) |
Customer relationships |
|
$ |
120,000 |
|
$ |
(100,962) |
|
$ |
19,038 |
|
6.0 |
License |
|
|
750 |
|
|
(294) |
|
|
456 |
|
10.0 |
Total intangible assets subject to amortization |
|
$ |
120,750 |
|
$ |
(101,256) |
|
$ |
19,494 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
December 31, 2018 |
|
|
|
|
|
|
|
|
|
|
|
Weighted- |
|
|
|
|
|
|
|
|
|
|
|
Average |
|
|
Gross Carrying |
|
Accumulated |
|
Net Carrying |
|
Amortization |
|
|
Amount |
|
Amortization |
|
Amount |
|
Period (Years) |
Customer relationships |
|
$ |
120,000 |
|
$ |
(91,756) |
|
$ |
28,244 |
|
6.0 |
Licenses |
|
|
3,368 |
|
|
(2,874) |
|
|
494 |
|
5.6 |
Total intangible assets subject to amortization |
|
$ |
123,368 |
|
$ |
(94,630) |
|
$ |
28,738 |
|
|
The aggregate amortization expense is as follows (in thousands):
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Three Months Ended |
|
Six Months Ended |
|
|
|
June 30, |
|
June 30, |
|
|
|
2019 |
|
2018 |
|
2019 |
|
2018 |
|
Amortization expense |
|
$ |
4,622 |
|
$ |
6,553 |
|
$ |
9,244 |
|
$ |
13,057 |
|
The following table sets forth the Company’s estimated aggregate amortization expense for each of the five years below (in thousands):
|
|
|
|
|
|
Amortization |
Year ended December 31, |
|
Expense |
2020 |
|
$ |
9,906 |
2021 |
|
|
75 |
2022 |
|
|
75 |
2023 |
|
|
75 |
2024 |
|
|
75 |
|