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STOCK PLANS AND SHARE BASED COMPENSATION (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) plans purchaseperiods shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 shares
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 | 2,000,000 |  |  |
Stock-based compensation expense | $ | $ 24,677,000 | $ 20,900,000 | $ 14,800,000 |
2016 Incentive Award Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock reserved for future issuance under stock option and stock purchase plans | shares | 1,500,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number | shares | 35,000 |  |  |
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 | $ | $ 15,200,000 | 13,000,000 | 12,700,000 |
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 | $ | $ 100,000 |  |  |
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 | 3,500,000 |  |  |
Number of shares purchased | shares | 3,000,000 |  |  |
Common stock reserved for future issuance under stock option and stock purchase plans | shares | 500,000 |  |  |
Stock-based compensation expense | $ | $ 1,300,000 | $ 1,300,000 | $ 1,200,000 |
Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards vesting period | 4 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares | 511,000 | 697,000 | 1,030,000 | 1,344,000
Stock-based compensation expense | $ |  | $ 200,000 | $ 700,000 |
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 | $ | $ 100,000 |  |  |
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 | $ | $ 100,000 |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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