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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Goodwill [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  | $ 198,622 |  |
Increase from acquisition |  |  | 60,590 |  |
Balance as of end of period | $ 259,212 |  | 259,212 |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization of intangible assets | 5,000 | $ 4,000 | 10,000 | $ 8,000 |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Cost | 265,164 |  | 265,164 |  | $ 202,164
Accumulated Amortization | (116,218) |  | (116,218) |  | (106,247)
Accumulated Impairment Loss | (1,025) |  | (1,025) |  | (1,025)
Net Intangible Assets | 147,921 |  | 147,921 |  | 94,892
Supply Chain Management |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  | 63,190 |  |
Increase from acquisition |  |  | 0 |  |
Balance as of end of period | 63,190 |  | 63,190 |  |
Federal Services |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  | 30,883 |  |
Increase from acquisition |  |  | 0 |  |
Balance as of end of period | 30,883 |  | 30,883 |  |
Aviation |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance as of beginning of period |  |  | 104,549 |  |
Increase from acquisition |  |  | 60,590 |  |
Balance as of end of period | 165,139 |  | 165,139 |  |
Contract and customer-related |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Cost | 228,094 |  | 228,094 |  | 173,094
Accumulated Amortization | (94,185) |  | (94,185) |  | (86,076)
Accumulated Impairment Loss | (1,025) |  | (1,025) |  | (1,025)
Net Intangible Assets | 132,884 |  | 132,884 |  | 85,993
Acquired technologies |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Cost | 12,400 |  | 12,400 |  | 12,400
Accumulated Amortization | (9,096) |  | (9,096) |  | (8,533)
Accumulated Impairment Loss | 0 |  | 0 |  | 0
Net Intangible Assets | 3,304 |  | 3,304 |  | 3,867
Trade names |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Cost | 24,670 |  | 24,670 |  | 16,670
Accumulated Amortization | (12,937) |  | (12,937) |  | (11,638)
Accumulated Impairment Loss | 0 |  | 0 |  | 0
Net Intangible Assets | $ 11,733 |  | $ 11,733 |  | $ 5,032

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