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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Goodwill [Roll Forward] |  |  |
Balance, beginning balance | $ 198,545 | $ 92,052 |
Increase from acquisitions | 77 | 106,493 |
Balance, ending balance | 198,622 | 198,545 | $ 92,052
Amortization of intangible assets | 16,067 | 15,576 | 10,048
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 202,164 | 202,214 |
Accumulated Amortization | (74,213) | (58,146) |
Accumulated Impairment Loss | (1,025) | (1,025) |
Net Intangible Assets | 126,926 | 143,043 |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
2017 | 16,017 |  |
2018 | 16,017 |  |
2019 | 15,953 |  |
2020 | 15,362 |  |
2021 | 14,998 |  |
Thereafter | 48,579 |  |
Total | 126,926 | 143,043 |
Supply Chain Management |  |  |
Goodwill [Roll Forward] |  |  |
Balance, beginning balance | 63,113 | 61,169 |
Increase from acquisitions | 77 | 1,944 |
Balance, ending balance | 63,190 | 63,113 | 61,169
IT, Energy and Management Consulting |  |  |
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 | 0 |
Increase from acquisitions | 0 | 104,549 |
Balance, ending balance | 104,549 | 104,549 | $ 0
Contract and customer-related |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 173,094 | 173,084 |
Accumulated Amortization | (59,799) | (46,611) |
Accumulated Impairment Loss | (1,025) | (1,025) |
Net Intangible Assets | 112,270 | 125,448 |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Total | 112,270 | 125,448 |
Acquired technologies |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 12,400 | 12,400 |
Accumulated Amortization | (6,278) | (5,151) |
Accumulated Impairment Loss | 0 | 0 |
Net Intangible Assets | 6,122 | 7,249 |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Total | 6,122 | 7,249 |
Trade names |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 16,670 | 16,730 |
Accumulated Amortization | (8,136) | (6,384) |
Accumulated Impairment Loss | 0 | 0 |
Net Intangible Assets | 8,534 | 10,346 |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Total | $ 8,534 | $ 10,346 |

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