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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Goodwill [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  | $ 198,622 |  |
Balance as of end of period | $ 198,622 |  | 198,622 |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization of intangible assets | 4,005 | $ 4,005 | 12,013 | $ 12,013 |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Cost | 202,164 |  | 202,164 |  | $ 202,164
Accumulated Amortization | (102,243) |  | (102,243) |  | (90,230)
Accumulated Impairment Loss | (1,025) |  | (1,025) |  | (1,025)
Net Intangible Assets | 98,896 |  | 98,896 |  | 110,909
Supply Chain Management |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  | 63,190 |  |
Balance as of end of period | 63,190 |  | 63,190 |  |
Federal Services |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  | 30,883 |  |
Balance as of end of period | 30,883 |  | 30,883 |  |
Aviation |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  | 104,549 |  |
Balance as of end of period | 104,549 |  | 104,549 |  |
Contract and customer-related |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Cost | 173,094 |  | 173,094 |  | 173,094
Accumulated Amortization | (82,791) |  | (82,791) |  | (72,937)
Accumulated Impairment Loss | (1,025) |  | (1,025) |  | (1,025)
Net Intangible Assets | 89,278 |  | 89,278 |  | 99,132
Acquired technologies |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Cost | 12,400 |  | 12,400 |  | 12,400
Accumulated Amortization | (8,251) |  | (8,251) |  | (7,406)
Accumulated Impairment Loss | 0 |  | 0 |  | 0
Net Intangible Assets | 4,149 |  | 4,149 |  | 4,994
Trade names |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Cost | 16,670 |  | 16,670 |  | 16,670
Accumulated Amortization | (11,201) |  | (11,201) |  | (9,887)
Accumulated Impairment Loss | 0 |  | 0 |  | 0
Net Intangible Assets | $ 5,469 |  | $ 5,469 |  | $ 6,783

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