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OTHER ACCRUED LIABILITIES (Tables) | 12 Months Ended
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Dec. 31, 2020
Other Liabilities Disclosure [Abstract] |
Schedule of other accrued liabilities | As of December 31, 2020 and 2019, other accrued liabilities were:
| 2020 |  | 2019
Accrued and deferred compensation | $ | 19,473 |  |  | $ | 22,543 |
Accrued benefits and workers' compensation claims | 5,733 |  |  | 6,241 |
Unearned revenue and customer deposits | 2,172 |  |  | 2,024 |
Due to contracts and agencies | 3,305 |  |  | 3,325 |
Current portion of operating lease | 1,757 |  |  | 1,452 |
Other | 4,123 |  |  | 2,988 |
Total other accrued liabilities | $ | 36,563 |  |  | $ | 38,573 |

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