| Intangible Assets |
The gross carrying amounts of intangible assets included within other long-term 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, 2017 |
|
| |
|
Gross Carrying
Amount |
|
|
Accumulated
Amortization |
|
|
Net Carrying
Amount |
|
|
Weighted-
Average
Amortization
Period (Years) |
|
| Customer relationships |
|
$ |
120,000 |
|
|
$ |
(51,730 |
) |
|
$ |
68,270 |
|
|
|
6.0 |
|
| Licenses |
|
|
3,368 |
|
|
|
(1,171 |
) |
|
|
2,197 |
|
|
|
5.6 |
|
| Non-compete agreements |
|
|
660 |
|
|
|
(660 |
) |
|
|
— |
|
|
|
1.0 |
|
| Total intangible assets subject to amortization |
|
$ |
124,028 |
|
|
$ |
(53,561 |
) |
|
$ |
70,467 |
|
|
|
|
|
| License (Indefinite-lived) |
|
$ |
4,427 |
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
December 31, 2016 |
|
| |
|
Gross Carrying
Amount |
|
|
Accumulated
Amortization |
|
|
Net Carrying
Amount |
|
|
Weighted-
Average
Amortization
Period (Years) |
|
| Customer relationships |
|
$ |
120,000 |
|
|
$ |
(36,593 |
) |
|
$ |
83,407 |
|
|
|
6.0 |
|
| Licenses |
|
|
3,368 |
|
|
|
(807 |
) |
|
|
2,561 |
|
|
|
5.6 |
|
| Non-compete agreements |
|
|
660 |
|
|
|
(495 |
) |
|
|
165 |
|
|
|
1.0 |
|
| Total intangible assets subject to amortization |
|
$ |
124,028 |
|
|
$ |
(37,895 |
) |
|
$ |
86,133 |
|
|
|
|
|
| License (Indefinite-lived) |
|
$ |
4,427 |
|
|
|
|
|
|
|
|
|
|
|
|
|
The aggregate amortization expense is as follows (in thousands):
| |
|
Three Months Ended
June 30, |
|
|
Six Months Ended
June 30, |
|
| |
|
2017 |
|
|
2016 |
|
|
2017 |
|
|
2016 |
|
| Amortization expense |
|
$ |
7,750 |
|
|
$ |
5,562 |
|
|
$ |
15,665 |
|
|
$ |
10,951 |
|
The following table sets forth the Company’s estimated aggregate amortization expense for each of the five years below (in thousands):
| Year ended December 31, |
|
Amortization
Expense |
|
| 2018 |
|
$ |
26,163 |
|
| 2019 |
|
|
18,489 |
|
| 2020 |
|
|
9,906 |
|
| 2021 |
|
|
75 |
|
| 2022 |
|
|
75 |
|
|