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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Roll Forward] |  |  |
Balance, beginning balance | $ 198,622 | $ 198,622 |
Increase from acquisitions | 77,828 | 0 |
Balance, ending balance | 276,450 | 198,622 | $ 198,622
Amortization of intangible assets | 19,317 | 16,017 | 16,017
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 258,764 | 202,164 |
Accumulated Amortization | (125,564) | (106,247) |
Accumulated Impairment Loss | (1,025) | (1,025) |
Net Intangible Assets | 132,175 | 94,892 |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
2020 | 18,809 |  |
2021 | 18,446 |  |
2022 | 16,700 |  |
2023 | 12,700 |  |
2024 | 9,119 |  |
Thereafter | 56,401 |  |
Net Intangible Assets | 132,175 | 94,892 |
Supply Chain Management |  |  |
Goodwill [Roll Forward] |  |  |
Balance, beginning balance | 63,190 | 63,190 |
Increase from acquisitions | 0 | 0 |
Balance, ending balance | 63,190 | 63,190 | 63,190
Federal Services Group |  |  |
Goodwill [Roll Forward] |  |  |
Balance, beginning balance | 30,883 | 30,883 |
Increase from acquisitions | 0 | 0 |
Balance, ending balance | 30,883 | 30,883 | 30,883
Aviation |  |  |
Goodwill [Roll Forward] |  |  |
Balance, beginning balance | 104,549 | 104,549 |
Increase from acquisitions | 77,828 | 0 |
Balance, ending balance | 182,377 | 104,549 | $ 104,549
Contract and customer-related |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 227,594 | 173,094 |
Accumulated Amortization | (102,169) | (86,076) |
Accumulated Impairment Loss | (1,025) | (1,025) |
Net Intangible Assets | 124,400 | 85,993 |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Net Intangible Assets | 124,400 | 85,993 |
Acquired technologies |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 12,400 | 12,400 |
Accumulated Amortization | (9,660) | (8,533) |
Accumulated Impairment Loss | 0 | 0 |
Net Intangible Assets | 2,740 | 3,867 |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Net Intangible Assets | 2,740 | 3,867 |
Trade names |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 18,770 | 16,670 |
Accumulated Amortization | (13,735) | (11,638) |
Accumulated Impairment Loss | 0 | 0 |
Net Intangible Assets | 5,035 | 5,032 |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Net Intangible Assets | $ 5,035 | $ 5,032 |

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