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STOCK-BASED COMPENSATION Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |
Stock-Based Compensation Expense | $ 4,969 | $ 4,416
Stock Options |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |
Stock-Based Compensation Expense |  | 100
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 | 1,200 | 700
Restricted Stock Units (RSUs) |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |
Stock-Based Compensation Expense | 3,500 | 3,300
Employee Stock Purchase Plan |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |
Stock-Based Compensation Expense | 300 | 300
Cost of revenues |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |
Stock-Based Compensation Expense | 143 | 90
Research and development |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |
Stock-Based Compensation Expense | 1,634 | 1,469
Sales and marketing |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |
Stock-Based Compensation Expense | 1,097 | 1,027
General and administrative |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |
Stock-Based Compensation Expense | $ 2,095 | $ 1,830

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