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STOCK PLANS AND SHARE BASED COMPENSATION (Stock-Based Compensation) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | $ 21,580 | $ 24,700 | $ 20,900
Unrecognized compensation costs | 36,726 |  |
Cost of revenues [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | 1,097 | 1,321 | 1,148
Research and Development Expense [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | 7,688 | 8,496 | 7,309
Selling and Marketing Expense [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | 4,729 | 5,197 | 4,489
General and Administrative Expense [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | $ 8,066 | 9,663 | 7,939
Stock Options [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Awards vesting period | 4 years |  |
Stock-based compensation expense |  |  | 200
Performance Based Awards, Long-term and Short-term [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | $ 3,400 | 8,200 | 6,400
Long-Term Performance-based Awards [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Unrecognized compensation costs | $ 2,042 |  |
Unrecognized compensation costs, period of recognition (in years) | 10 months 28 days |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Awards vesting period | 4 years |  |
Stock-based compensation expense | $ 16,600 | 15,200 | 13,000
Unrecognized compensation costs | $ 34,546 |  |
Unrecognized compensation costs, period of recognition (in years) | 3 years 3 months 8 days |  |
Employee Stock [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | $ 1,600 | $ 1,300 | $ 1,300
Unrecognized compensation costs | $ 138 |  |
Unrecognized compensation costs, period of recognition (in years) | 1 month |  |

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