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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Roll Forward] |  |  |
Balance, beginning balance | $ 198,622 | $ 198,622 |
Increase from acquisitions | 0 | 0 |
Balance, ending balance | 198,622 | 198,622 | $ 198,622
Amortization of intangible assets | 16,017 | 16,017 | 16,067
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 202,164 | 202,164 |
Accumulated Amortization | (106,247) | (90,230) |
Accumulated Impairment Loss | (1,025) | (1,025) |
Net Intangible Assets | 94,892 | 110,909 |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
2019 | 15,953 |  |
2020 | 15,362 |  |
2021 | 14,998 |  |
2022 | 13,252 |  |
2023 | 9,252 |  |
Thereafter | 26,075 |  |
Total | 94,892 | 110,909 |
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 | 0 | 0 |
Balance, ending balance | 104,549 | 104,549 | $ 104,549
Contract and customer-related |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 173,094 | 173,094 |
Accumulated Amortization | (86,076) | (72,937) |
Accumulated Impairment Loss | (1,025) | (1,025) |
Net Intangible Assets | 85,993 | 99,132 |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Total | 85,993 | 99,132 |
Acquired technologies |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 12,400 | 12,400 |
Accumulated Amortization | (8,533) | (7,406) |
Accumulated Impairment Loss | 0 | 0 |
Net Intangible Assets | 3,867 | 4,994 |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Total | 3,867 | 4,994 |
Trade names |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 16,670 | 16,670 |
Accumulated Amortization | (11,638) | (9,887) |
Accumulated Impairment Loss | 0 | 0 |
Net Intangible Assets | 5,032 | 6,783 |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Total | $ 5,032 | $ 6,783 |

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