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INCOME TAXES - Reconciliation between the federal statutory rate and effective tax rate (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
INCOME TAXES |  |  |
Federal statutory rate | 21.00% | 21.00% | 21.00%
State income taxes, net of federal benefit | 0.90% | 1.40% | 1.00%
Research and experimentation credit | (0.90%) | (1.50%) | (1.20%)
Non-deductible expenses | (0.80%) | 0.10% | (0.70%)
Change in contingencies | 0.40% | 0.10% | (0.10%)
Adjustments related to vesting of restricted stock | (1.00%) | (1.50%) | (1.50%)
Other | 0.70% | 0.90% | (0.50%)
Effective tax rate | 20.30% | 20.50% | 18.00%

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