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STOCK PLANS AND SHARE BASED COMPENSATION (Stock-Based Compensation) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | $ 24,677 | $ 20,900 | $ 14,800
Unrecognized compensation costs | 38,779 |  |
Cost of revenues [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | 1,321 | 1,148 | 933
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 | 8,496 | 7,309 | 5,255
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 | 5,197 | 4,489 | 3,644
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 | $ 9,663 | 7,939 | 4,935
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 | 700
Performance Based Awards [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | $ 8,200 | 6,400 | 300
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 | $ 3,519 |  |
Unrecognized compensation costs, period of recognition (in years) | 1 year 4 months 10 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 | $ 15,200 | 13,000 | 12,700
Unrecognized compensation costs | $ 35,132 |  |
Unrecognized compensation costs, period of recognition (in years) | 3 years 8 months 22 days |  |
Employee Stock [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | $ 1,300 | $ 1,300 | $ 1,200
Unrecognized compensation costs | $ 128 |  |
Unrecognized compensation costs, period of recognition (in years) | 1 month |  |

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