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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets Changes in goodwill for the years ended December 31, 2016 and 2015 are as follows (in thousands):
| Supply Chain Management |  | IT, Energy and Management Consulting |  | Aviation |  | Total
Balance as of December 31, 2014 | $ | 61,169 |  |  | $ | 30,883 |  |  | $ | — |  |  | $ | 92,052 |
Increase from acquisitions | 1,944 |  |  | — |  |  | 104,549 |  |  | 106,493 |
Balance as of December 31, 2015 | $ | 63,113 |  |  | $ | 30,883 |  |  | $ | 104,549 |  |  | $ | 198,545 |
Increase from acquisitions | 77 |  |  | — |  |  | — |  |  | 77 |
Balance as of December 31, 2016 | $ | 63,190 |  |  | $ | 30,883 |  |  | $ | 104,549 |  |  | $ | 198,622 |
The results of our annual goodwill impairment testing in the fourth quarter of 2016 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, 2016, 2015 and 2014 was approximately $16.1 million, $15.6 million and $10.0 million, respectively. Intangible assets were composed of the following (in thousands):
| Cost |  | Accumulated Amortization |  | Accumulated Impairment Loss |  | Net Intangible Assets
December 31, 2016 |  |  |  |  |  |  |
Contract and customer-related | $ | 173,094 |  |  | $ | (59,799 | ) |  | $ | (1,025 | ) |  | $ | 112,270 |
Acquired technologies | 12,400 |  |  | (6,278 | ) |  | — |  |  | 6,122 |
Trade names | 16,670 |  |  | (8,136 | ) |  | — |  |  | 8,534 |
Total | $ | 202,164 |  |  | $ | (74,213 | ) |  | $ | (1,025 | ) |  | $ | 126,926 |
December 31, 2015 |  |  |  |  |  |  |  |  |  |  |
Contract and customer-related | $ | 173,084 |  |  | $ | (46,611 | ) |  | $ | (1,025 | ) |  | $ | 125,448 |
Acquired technologies | 12,400 |  |  | (5,151 | ) |  | — |  |  | 7,249 |
Trade names | 16,730 |  |  | (6,384 | ) |  | — |  |  | 10,346 |
Total | $ | 202,214 |  |  | $ | (58,146 | ) |  | $ | (1,025 | ) |  | $ | 143,043 |
Future expected amortization of intangible assets is as follows for the years ending December 31, (in thousands):
| Amortization
2017 | $ | 16,017 |
2018 | 16,017 |
2019 | 15,953 |
2020 | 15,362 |
2021 | 14,998 |
Thereafter | 48,579 |
Total | $ | 126,926 |

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