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Goodwill and Intangible Assets | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets Changes in goodwill for the nine months ended September 30, 2018 are as follows (in thousands):
|  | Supply Chain Management |  | Federal Services |  | Aviation |  | Total
Balance as of December 31, 2017 |  | $ | 63,190 |  |  | $ | 30,883 |  |  | $ | 104,549 |  |  | $ | 198,622 |
Balance as of September 30, 2018 |  | $ | 63,190 |  |  | $ | 30,883 |  |  | $ | 104,549 |  |  | $ | 198,622 |
Intangible assets consist of the value of contract and customer-related intangible assets, acquired technologies and trade names. Amortization expense was approximately $4.0 million and $12.0 million for the three and nine months ended September 30, 2018 and September 30, 2017, respectively. Intangible assets, net were comprised of the following (in thousands):
|  | Cost |  | Accumulated Amortization |  | Accumulated Impairment Loss |  | Net Intangible Assets
September 30, 2018 |  |  |  |  |  |  |  |
Contract and customer-related |  | $ | 173,094 |  |  | $ | (82,791 | ) |  | $ | (1,025 | ) |  | $ | 89,278 |
Acquired technologies |  | 12,400 |  |  | (8,251 | ) |  | — |  |  | 4,149 |
Trade names |  | 16,670 |  |  | (11,201 | ) |  | — |  |  | 5,469 |
Total |  | $ | 202,164 |  |  | $ | (102,243 | ) |  | $ | (1,025 | ) |  | $ | 98,896 |
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 |

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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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