| 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 table (in thousands, except amortization period):
| |
|
September 30, 2015 |
|
| |
|
Gross Carrying
Amount
|
|
|
Accumulated
Amortization
|
|
|
Net Carrying
Amount
|
|
|
Weighted-
Average
Amortization
Period (Years)
|
|
| Customer relationship |
|
$ |
120,000 |
|
|
$ |
(12,113 |
) |
|
$ |
107,887 |
|
|
|
6.0 |
|
| Backlog |
|
|
70,000 |
|
|
|
(60,472 |
) |
|
|
9,528 |
|
|
|
1.0 |
|
| Licenses |
|
|
3,368 |
|
|
|
(115 |
) |
|
|
3,253 |
|
|
|
5.6 |
|
| Total intangible assets subject to amortization |
|
$ |
193,368 |
|
|
$ |
(72,700 |
) |
|
$ |
120,668 |
|
|
|
|
|
The aggregate amortization expense is as follows (in thousands):
| |
|
Three Months Ended
September 30, |
|
|
Nine Months Ended
September 30, |
|
| |
|
2015 |
|
|
2014 |
|
|
2015 |
|
|
2014 |
|
| Amortization expense |
|
$ |
20,951 |
|
|
$ |
— |
|
|
$ |
60,172 |
|
|
$ |
— |
|
| |
|
December 31, 2014 |
|
| |
|
Gross Carrying
Amount |
|
|
Accumulated
Amortization |
|
|
Net Carrying
Amount |
|
|
Weighted-
Average
Amortization
Period (Years) |
|
| Customer relationship |
|
$ |
120,000 |
|
|
$ |
(4,556 |
) |
|
$ |
115,444 |
|
|
|
6.0 |
|
| Backlog |
|
|
70,000 |
|
|
|
(7,972 |
) |
|
|
62,028 |
|
|
|
1.0 |
|
| Total intangible assets subject to amortization |
|
$ |
190,000 |
|
|
$ |
(12,528 |
) |
|
$ |
177,472 |
|
|
|
|
|
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 |
|
| 2016 |
|
$ |
21,659 |
|
| 2017 |
|
|
31,177 |
|
| 2018 |
|
|
26,058 |
|
| 2019 |
|
|
18,489 |
|
| 2020 |
|
|
9,906 |
|
|