INCOME TAXES (Reconciliation of Income Tax Uncertainties) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Valuation Allowance [Line Items]
Valuation allowance	$ 11,189	$ 5,414
Reconciliation of the beginning and ending amount of income tax uncertainties
Balance at the beginning of period	3,080	6,356	$ 7,934
Increases based on tax positions for the current year	360	370	270
Increases based on tax positions of prior years	610	1,562	1,283
Decreases based on tax positions of prior years	0		(1,472)
Settlements	(491)	(4,874)	(1,444)
Lapse of statute of limitations	0	(334)	(215)
Balance at the end of period	3,559	3,080	6,356
Foreign taxes payable in the event of non-fulfillment of terms of government grants	1,700
Amount of income tax uncertainties that, if recognized, would impact the effective tax rate	3,600
Decrease in liability for uncertain tax positions, high end of range	1,500
Unrecognized tax benefits, amount accrued for the payment of interest and penalties	1,900	1,600	1,500
Unrecognized tax benefits, amount recognized in income tax expense	400	$ 100	$ 400
Deferred tax assets related to tax credit carryforwards, U.S. state
Valuation Allowance [Line Items]
Valuation allowance	3,100
Deferred tax assets for specified locations
Valuation Allowance [Line Items]
Valuation allowance	$ 8,100