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STOCK PLANS AND SHARE BASED COMPENSATION (Details) $ in Thousands, shares in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) period plan shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of stock-based compensation plans | plan | 3 |  |
Number of shares available for future issuance | 3.4 |  |
Stock-based compensation expense | $ | $ 30,912 | $ 23,347 | $ 21,580
2016 Incentive Award Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | 2.2 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 2.8 |  |
Incentive Stock Options [Member] | 2007 Equity Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercise price of stock options as percentage of fair market value on date of grant, minimum | 100.00% |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awards vesting period | 4 years |  |
Stock-based compensation expense | $ | $ 18,700 | 17,500 | 16,600
Employee Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum percentage of employee's compensation eligible for payroll deductions | 15.00% |  |
Purchase price of the purchase plan as percentage of the lower of the fair market value on the first day of each offering period or on the purchase date | 85.00% |  |
Number of purchase periods in each offering period | period | 1 |  |
Duration of each purchase period in each offering period | 6 months |  |
Shares reserved for issuance | 7.0 |  |
Number of shares purchased | 6.6 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 0.4 |  |
Stock-based compensation expense | $ | $ 2,000 | $ 1,700 | $ 1,600
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awards vesting period | 4 years |  |
Stock Options [Member] | 2007 Equity Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awards vesting period | 48 months |  |
Stock Options [Member] | 2007 Equity Incentive Plan [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awards expiration period | 10 years |  |

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