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Business Acquisitions (Details) - USD ($) $ in Thousands | Jan. 31, 2017 | Jun. 30, 2018 | Dec. 30, 2017
--- | --- | --- | ---
Business Acquisitions |  |  |
Goodwill |  | $ 88,656 | $ 89,000
C1 Consulting LLC |  |  |
Business Acquisitions |  |  |
Maximum period for additional purchase consideration to be paid | 4 years |  |
Goodwill | $ 13,000 |  |
Amortizable intangible assets | 8,500 |  |
Contingent consideration liability | $ 2,400 |  |

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