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INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Taxes [Abstract]
Provision for income taxes	$ 20,638		$ 19,967	$ 45,296	$ 34,173
Effective tax rate	28.80%		32.20%	34.40%	33.00%
Net deferred tax assets	$ 1,400			$ 1,400
Net deferred tax liabilities						$ 2,900
Maximum [Member]
Income Taxes [Abstract]
Statute of limitations related to income tax examinations				10 years
Income Taxes [Abstract]
Decrease in unrecognized tax benefits within the next 12 months that is reasonably possible	2,000			$ 2,000
Minimum [Member]
Income Taxes [Abstract]
Decrease in unrecognized tax benefits within the next 12 months that is reasonably possible	1,000			$ 1,000
Mainland China [Member]
Income Taxes [Abstract]
Tax assessment (benefit)	$ (60,000)
Indonesia [Member]
Income Taxes [Abstract]
Tax assessment (benefit)		$ 5,800

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Statute of limitations period related to income tax examinations in certain countries, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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