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STOCK-BASED COMPENSATION 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
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-Based Compensation Expense | $ 6,327 | $ 5,012 | $ 11,296 | $ 9,428
Stock Options |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-Based Compensation Expense |  | 100 |  | 200
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 | 2,300 | 1,600 | 3,500 | 2,300
Restricted Stock Units (RSUs) |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-Based Compensation Expense | 3,700 | 3,000 | 7,200 | 6,300
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 | 600 | 600
Cost of revenues |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-Based Compensation Expense | 351 | 293 | 494 | 383
Research and development |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-Based Compensation Expense | 2,351 | 1,940 | 3,985 | 3,409
Sales and marketing |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-Based Compensation Expense | 1,189 | 899 | 2,286 | 1,926
General and administrative |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-Based Compensation Expense | $ 2,436 | $ 1,880 | $ 4,531 | $ 3,710

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