| Intangible Assets |
The carrying amounts of intangible assets subject to amortization are included within other long-term assets. As of September 30, 2017, the carrying amount of the indefinite-lived license is included in prepaid expenses and other assets as it is held for sale. 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):
| |
|
September 30, 2017 |
|
|
|
|
| |
|
Gross Carrying
Amount |
|
|
Accumulated
Amortization |
|
|
Net Carrying
Amount |
|
|
Weighted-
Average
Amortization
Period (Years) |
|
| Customer relationships |
|
$ |
120,000 |
|
|
$ |
(59,298 |
) |
|
$ |
60,702 |
|
|
|
6.0 |
|
| Licenses |
|
|
3,368 |
|
|
|
(1,382 |
) |
|
|
1,986 |
|
|
|
5.6 |
|
| Non-compete agreements |
|
|
660 |
|
|
|
(660 |
) |
|
|
— |
|
|
|
1.0 |
|
| Total intangible assets subject to amortization |
|
$ |
124,028 |
|
|
$ |
(61,340 |
) |
|
$ |
62,688 |
|
|
|
|
|
| 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
September 30, |
|
|
Nine Months Ended
September 30, |
|
| |
|
2017 |
|
|
2016 |
|
|
2017 |
|
|
2016 |
|
| Amortization expense |
|
$ |
7,780 |
|
|
$ |
5,601 |
|
|
$ |
23,445 |
|
|
$ |
16,552 |
|
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 |
|
|