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INCOME TAXES - Principal differences between federal statutory tax rate and income tax expense (Details 2)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal statutory tax rate	35.00%	35.00%	35.00%
State taxes, net of federal tax benefit	1.00%	3.80%	3.00%
Excess of (decreases in) foreign tax over US tax on foreign income	2.90%	(0.50%)	(1.10%)
Remeasurement of deferred taxes under TCJA	(7.70%)	0.00%	0.00%
Deemed repatriation tax	3.60%	0.00%	0.00%
Domestic tax deductions and credits	(3.10%)	(2.70%)	(1.20%)
Release of unrecognized tax benefit	(5.80%)	0.00%	0.00%
Other	(1.80%)	0.20%	(0.00%)
Effective tax rate	24.10%	35.80%	35.70%

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Percentage of Release of unrecognized tax benefit.

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

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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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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