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STOCK PLANS (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-Based Compensation      
Stock-based compensation expense $ 31,725 $ 31,601 $ 31,248
Compensation expense from stock options, employees 21,980 24,056 24,505
Compensation expense from stock options, non-employee awards 663 167 841
Restricted Stock or Unit Expense 8,371 6,698 5,117
Compensation expense from employee stock purchase plan 711 680 785
Stock-based compensation 31,725 31,601 31,248
Cost of revenues      
Share-Based Compensation      
Stock-based compensation expense 4,478 5,467 6,438
Research and development      
Share-Based Compensation      
Stock-based compensation expense 3,934 3,341 3,297
Selling, general and administrative      
Share-Based Compensation      
Stock-based compensation expense $ 23,313 $ 22,793 $ 21,513