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STOCK AWARD PLANS - Summary of Total Compensation Expense Recognized in Statements of Operations for Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 4,524 $ 10,606 $ 16,842 $ 25,785
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 624 1,878 3,626 5,215
Stock awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 3,312 8,181 11,722 19,021
Company expense on ESPP discount        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 588 $ 547 $ 1,494 $ 1,549