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GEOGRAPHIC AND SIGNIFICANT CUSTOMER INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue, Major Customer [Line Items]
Sales, net	$ 1,415,826	$ 788,948	$ 718,892
Product [Member]
Revenue, Major Customer [Line Items]
Sales, net	1,296,867	678,061	610,326
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Applied Materials, Inc. [Member]
Revenue, Major Customer [Line Items]
Sales, net	$ 248,350	$ 164,724	$ 258,027
Significant concentration risk, 10% or more of total balance	17.50%	20.90%	35.90%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Lam Research [Member]
Revenue, Major Customer [Line Items]
Sales, net	$ 141,778	$ 88,251	$ 109,005
Significant concentration risk, 10% or more of total balance	10.00%	11.20%	15.20%
Accounts Receivable [Member] | Applied Materials, Inc. [Member]
Revenue, Major Customer [Line Items]
Significant concentration risk, 10% or more of total balance	14.20%	14.90%
Accounts receivable	$ 33,402	$ 36,849
Accounts Receivable [Member] | Nidec Motor Corporation [Member]
Revenue, Major Customer [Line Items]
Significant concentration risk, 10% or more of total balance	10.40%	15.40%
Accounts receivable	$ 24,344	$ 38,071

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- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

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