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STOCK PLANS AND SHARE BASED COMPENSATION (Stock-Based Compensation) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | $ 30,912 | $ 23,347 | $ 21,580
Unrecognized compensation costs | 40,666 |  |
Cost of revenues [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | 1,963 | 1,237 | 1,097
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 | 10,378 | 8,423 | 7,688
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 | 6,290 | 5,015 | 4,729
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 | $ 12,281 | 8,672 | 8,066
Stock Options [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Awards vesting period | 4 years |  |
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 | $ 10,200 | 4,100 | 3,400
Long-Term Performance-based Awards [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Performance based period | 3 years |  |
Unrecognized compensation costs | $ 5,810 |  |
Unrecognized compensation costs, period of recognition (in years) | 1 year 7 months 20 days |  |
Number of performance-based awards shares released as a percentage of target number, minimum | 0.00% |  |
Number of performance-based awards shares released as a percentage of target number, maximum | 200.00% |  |
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 | $ 18,700 | 17,500 | 16,600
Unrecognized compensation costs | $ 34,654 |  |
Unrecognized compensation costs, period of recognition (in years) | 2 years 7 months 13 days |  |
Employee Stock [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | $ 2,000 | $ 1,700 | $ 1,600
Unrecognized compensation costs | $ 202 |  |
Unrecognized compensation costs, period of recognition (in years) | 29 days |  |

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