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INCOME TAXES - Reconciliation between the federal statutory rate and effective tax rate (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
INCOME TAXES
Federal statutory rate	21.00%	21.00%	21.00%
State income taxes, net of federal benefit	1.40%	1.00%	1.50%
Research and experimentation credit	(1.50%)	(1.20%)	(0.80%)
Non-deductible expenses	0.10%	(0.70%)	0.40%
Change in contingencies	0.10%	(0.10%)	0.40%
Adjustments related to the Act			(0.30%)
Adjustments related to vesting of restricted stock	(1.50%)	(1.50%)	(1.80%)
Other	0.90%	(0.50%)	(0.30%)
Effective tax rate	20.50%	18.00%	20.10%

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Percentage of adjustments related to vesting of restricted stock.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit.

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