INCOME TAXES (Income Tax Holiday) (Details) - Foreign - Belarus - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Holiday [Line Items]
Income tax holiday description	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:12px;text-align:left;text-indent:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In Belarus, member technology companies of High-Technologies Park, including our subsidiary, have a full exemption from Belarus income tax through </font><font style="font-family:inherit;font-size:10pt;">January 2049</font><font style="font-family:inherit;font-size:10pt;">. However, beginning February 1, 2018, the earnings of the Company’s Belarus local subsidiary are 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 previous years. The aggregate dollar benefits derived from this tax holiday approximated </font><font style="font-family:inherit;font-size:10pt;">$1,352</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;">$15,503</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">$13,605</font><font style="font-family:inherit;font-size:10pt;"> for the years ended December 31, 2018, </font><font style="font-family:inherit;font-size:10pt;">2017</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">2016</font><font style="font-family:inherit;font-size:10pt;">, respectively. The benefit the tax holiday had on diluted net income per share approximated </font><font style="font-family:inherit;font-size:10pt;">$0.02</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;">$0.28</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">$0.26</font><font style="font-family:inherit;font-size:10pt;"> for the years ended December 31, 2018, </font><font style="font-family:inherit;font-size:10pt;">2017</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">2016</font><font style="font-family:inherit;font-size:10pt;">, respectively.</font></div></div>
Income tax holiday termination date	1/1/2049
Aggregate dollar benefits from tax holiday	$ 1,352	$ 15,503	$ 13,605
Tax holiday benefit on diluted net income per share	$ 0.02	$ 0.28	$ 0.26