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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets Changes in goodwill for the years ended December 31, 2018 and 2017 are as follows (in thousands):
| Supply Chain Management |  | Federal Services |  | Aviation |  | Total
Balance as of December 31, 2016 | $ | 63,190 |  |  | $ | 30,883 |  |  | $ | 104,549 |  |  | $ | 198,622 |
Increase from acquisitions | — |  |  | — |  |  | — |  |  | — |
Balance as of December 31, 2017 | $ | 63,190 |  |  | $ | 30,883 |  |  | $ | 104,549 |  |  | $ | 198,622 |
Increase from acquisitions | — |  |  | — |  |  | — |  |  | — |
Balance as of December 31, 2018 | $ | 63,190 |  |  | $ | 30,883 |  |  | $ | 104,549 |  |  | $ | 198,622 |
The results of our annual goodwill impairment testing in the fourth quarter of 2018 indicated that the fair value of our reporting units exceeded their carrying values. Intangible assets consist of the value of contract-related assets, technologies and trade names. Amortization expense for the years ended December 31, 2018, 2017 and 2016 was approximately $16.0 million, $16.0 million and $16.1 million, respectively. Intangible assets were comprised of the following (in thousands):
| Cost |  | Accumulated Amortization |  | Accumulated Impairment Loss |  | Net Intangible Assets
December 31, 2018 |  |  |  |  |  |  |
Contract and customer-related | $ | 173,094 |  |  | $ | (86,076 | ) |  | $ | (1,025 | ) |  | $ | 85,993 |
Acquired technologies | 12,400 |  |  | (8,533 | ) |  | — |  |  | 3,867 |
Trade names | 16,670 |  |  | (11,638 | ) |  | — |  |  | 5,032 |
Total | $ | 202,164 |  |  | $ | (106,247 | ) |  | $ | (1,025 | ) |  | $ | 94,892 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Contract and customer-related | $ | 173,094 |  |  | $ | (72,937 | ) |  | $ | (1,025 | ) |  | $ | 99,132 |
Acquired technologies | 12,400 |  |  | (7,406 | ) |  | — |  |  | 4,994 |
Trade names | 16,670 |  |  | (9,887 | ) |  | — |  |  | 6,783 |
Total | $ | 202,164 |  |  | $ | (90,230 | ) |  | $ | (1,025 | ) |  | $ | 110,909 |
Future expected amortization of intangible assets is as follows for the years ending December 31, (in thousands):
| Amortization
2019 | $ | 15,953 |
2020 | 15,362 |
2021 | 14,998 |
2022 | 13,252 |
2023 | 9,252 |
Thereafter | 26,075 |
Total | $ | 94,892 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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