INCOME TAXES - Components of Income Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Components of income before income taxes
Domestic									$ (15,661)	$ 28,917	$ 25,232
Foreign									21,733	24,825	22,321
INCOME BEFORE INCOME TAXES	$ (4,307)	$ 6,678	$ 1,753	$ 1,948	$ 11,336	$ 27,920	$ 12,868	$ 1,618	$ 6,072	$ 53,742	$ 47,553

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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