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STOCK PLANS AND SHARE BASED COMPENSATION (Details) shares in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) plans purchaseperiods shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of stock-based compensation plans | plans | 3 |  |
Number of shares available for future issuance | shares | 2.1 |  |
Stock-based compensation expense | $ | $ 23,347,000 | $ 21,580,000 | $ 24,677,000
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, Number of Shares Issued | shares | 0.8 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares | 1.7 |  |
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 | $ | $ 17,500,000 | 16,600,000 | 15,200,000
Restricted Stock Units (RSUs) [Member] | Directors Equity Compensation Program [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Factor used to determine the number of options/units to be granted | $ | $ 120,000 |  |
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 period in each offering period | purchaseperiods | 1 |  |
Duration of each purchase period in each offering period | 6 months |  |
Shares reserved for issuance | shares | 3.5 |  |
Number of shares purchased | shares | 3.2 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares | 0.3 |  |
Stock-based compensation expense | $ | $ 1,700,000 | $ 1,600,000 | $ 1,300,000
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 |  |
Awards expiration period, maximum | 10 years |  |
Stock Options [Member] | Directors Equity Compensation Program [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Factor used to determine the number of options/units to be granted | $ | $ 120,000 |  |
Stock Options and Restricted Stock Units (RSUs) [Member] | Directors Equity Compensation Program [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Factor used to determine the number of options/units to be granted | $ | $ 120,000 |  |

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