INCOME TAXES - Schedule of effective tax rate (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
INCOME TAXES
U.S. federal statutory income tax rate	21.00%	21.00%
State income taxes, net of federal tax benefit	4.30%	3.60%
Non-taxable municipal bond interest	(0.40%)	(0.50%)
Foreign income tax rate differences		0.80%
Tax settlements	(1.20%)	0.00%
Share-based compensation	0.20%	(2.50%)
Other	(1.00%)	0.10%
Effective tax rate	22.90%	22.50%

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 applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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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 settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to non-taxable municipal bond interest.

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