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INCOME TAXES - Reconciliation between the federal statutory rate and effective tax rate (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
INCOME TAXES
Federal statutory rate	21.00%	21.00%	35.00%
State income taxes, net of federal benefit	1.00%	1.50%	1.10%
Research and experimentation credit	(1.20%)	(0.80%)	(0.80%)
Non-deductible expenses	(0.70%)	0.40%	(3.50%)
Change in contingencies	(0.10%)	0.40%	0.50%
Adjustments related to the Act	0.00%	(0.30%)	5.60%
Adjustments related to vesting of restricted stock	(1.50%)	(1.80%)	(2.40%)
Other	(0.50%)	(0.30%)	0.10%
Effective tax rate	18.00%	20.10%	35.60%

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Percentage of adjustments related to vesting of restricted stock.

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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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