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STOCK PLANS AND SHARE BASED COMPENSATION (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) plans purchaseperiods shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 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 | 1,600,000 |  |  |
Stock-based compensation expense | $ | $ 21,580,000 | $ 24,700,000 | $ 20,900,000 |
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 | 1,100,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number | shares | 400,000 |  |  |
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 | $ | $ 16,600,000 | 15,200,000 | 13,000,000 |
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 | 3,100,000 |  |  |
Common stock reserved for future issuance under stock option and stock purchase plans | shares | 400,000 |  |  |
Stock-based compensation expense | $ | $ 1,600,000 | $ 1,300,000 | $ 1,300,000 |
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 | 335,000 | 511,000 | 697,000 | 1,030,000
Stock-based compensation expense | $ |  |  | $ 200,000 |
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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