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Intangible Assets | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Note 7. Intangible Assets The following table provides the gross carrying amount and related accumulated amortization of intangible assets:
|  | December 31, 2017 |  |  | December 31, 2016 |
In thousands |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Amount |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Amount |
Software |  | $ | 13,396 |  |  | $ | (3,550 | ) |  | $ | 9,846 |  |  | $ | 8,743 |  |  | $ | (3,220 | ) |  | $ | 5,523 |
Customer list |  |  | 2,485 |  |  |  | (2,440 | ) |  |  | 45 |  |  |  | 2,485 |  |  |  | (2,276 | ) |  |  | 209 |
Goodwill |  |  | 950 |  |  |  | (234 | ) |  |  | 716 |  |  |  | 950 |  |  |  | (234 | ) |  |  | 716 |
Total intangible assets |  | $ | 16,831 |  |  | $ | (6,224 | ) |  | $ | 10,607 |  |  | $ | 12,178 |  |  | $ | (5,730 | ) |  | $ | 6,448 |
Intangible amortization expense for the years ended December 31, 2017, 2016, and 2015 totaled $2.2 million, $1.9 million, and $0.8 million, respectively. The following table sets forth the future amortization of intangible assets:
In thousands |  | Amount |
2018 |  | $ | 1,912 |
2019 |  |  | 1,671 |
2020 |  |  | 1,531 |
2021 |  |  | 1,461 |
2022 |  |  | 1,453 |
Thereafter |  |  | 1,863 |
Total |  | $ | 9,891 |
The Company performs an annual impairment test on goodwill during the fourth quarter of each fiscal year. There were no goodwill additions or impairment losses for the years ended December 31, 2017 and 2016, respectively.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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