INCOME TAXES (Income Tax Holiday) (Details) - Foreign - Belarus - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Holiday [Line Items]
Income tax holiday description	In Belarus, member technology companies of High-Technologies Park, including the Company’s local subsidiary, have a full exemption from Belarus income tax on qualifying income through January 2049. However, beginning February 1, 2018, the earnings of the Company’s Belarus local subsidiary became subject to U. S. income taxation due to the Company’s decision to change the tax status of the subsidiary. Consequently, there was less income tax benefit from the Belarus tax exemption for the year ended December 31, 2018 compared to the previous year. There was no aggregate dollar benefit derived from this tax holiday for the year ended December 31, 2019, and the aggregate dollar benefits derived from this tax holiday approximated $1,352 and $15,503 for the years ended December 31, 2018 and 2017, respectively. There was no impact on diluted net income per share for the year ended December 31, 2019. The benefit the tax holiday had on diluted net income per share approximated $0.02 and $0.28 for the years ended December 31, 2018 and 2017, respectively.
Income tax holiday termination date	2049-01
Aggregate dollar benefits from tax holiday	$ 0	$ 1,352	$ 15,503
Tax holiday benefit on diluted net income per share	$ 0	$ 0.02	$ 0.28