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Accrued Expenses (Tables) | 6 Months Ended
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Jun. 27, 2020
Accrued Expenses |
Schedule of accrued expenses | Accrued expenses consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 27, 2020 | ​ | December 28, 2019
Compensation and related expenses | ​ | $ | 68,832 | ​ | $ | 99,993
Income taxes payable | ​ |  | 3,321 | ​ |  | 430
Commissions due to non-employee experts | ​ | ​ | 293 | ​ | ​ | 9,961
Other professional fees | ​ | ​ | 2,502 | ​ | ​ | 2,077
Direct project accruals | ​ | ​ | 3,320 | ​ | ​ | 3,201
Accrued leasehold improvements | ​ | ​ | 895 | ​ | ​ | 2,166
Other | ​ |  | 3,036 | ​ |  | 3,473
Total accrued expenses | ​ | $ | 82,199 | ​ | $ | 121,301
​

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