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STOCK-BASED COMPENSATION Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |
Stock-Based Compensation Expense | $ 4,407 | $ 5,625
Performance Based Awards and Long Term Performance based Units |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |
Stock-Based Compensation Expense | (600) | 900
Restricted Stock Units (RSUs) |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |
Stock-Based Compensation Expense | 4,600 | 4,300
Employee Stock Purchase Plan |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |
Stock-Based Compensation Expense | 400 | 400
Cost of revenues |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |
Stock-Based Compensation Expense | 271 | 249
Research and development |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |
Stock-Based Compensation Expense | 1,632 | 1,839
Sales and marketing |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |
Stock-Based Compensation Expense | 1,061 | 1,276
General and administrative |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |
Stock-Based Compensation Expense | $ 1,443 | $ 2,261

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