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SIGNIFICANT CUSTOMER INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Revenue, Major Customer [Line Items]
Sales, net	$ 361,311	$ 339,880	$ 712,931	$ 655,336
Product [Member]
Revenue, Major Customer [Line Items]
Sales, net	325,522	311,770	644,401	601,131
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Applied Materials, Inc. [Member]
Revenue, Major Customer [Line Items]
Sales, net	$ 73,833	$ 64,408	$ 141,621	$ 115,389
Significant concentration risk, 10% or more of total balance	20.40%	19.00%	19.90%	17.60%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Lam Research [Member]
Revenue, Major Customer [Line Items]
Sales, net	$ 36,317
Significant concentration risk, 10% or more of total balance	10.10%
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Applied Materials, Inc. [Member]
Revenue, Major Customer [Line Items]
Significant concentration risk, 10% or more of total balance			17.00%		14.20%
Accounts receivable	$ 41,397		$ 41,397		$ 33,402
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Nidec Motor Corporation [Member]
Revenue, Major Customer [Line Items]
Significant concentration risk, 10% or more of total balance					10.40%
Accounts receivable					$ 24,344

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