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EMPLOYEE BENEFIT PLAN (Details) - Employee 401(k) Plan - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Employee Benefit Plant |  |  |
Annual employee contribution limit as a percent of compensation | 15.00% |  |
Employer matching contribution as a percentage of the employee's contribution | 50.00% |  |
Percent of employee's earnings eligible for employer matching contribution | 6.00% |  |
Percentage of contribution vested each year | 25.00% |  |
Vesting period of contribution by the company | 4 years |  |
Matching contributions by the company | $ 2.9 | $ 2.5 | $ 2.0

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- Definition Represents the vesting period for matching contributions by the company. + References No definition available. + Details
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- Definition Represents the percent of employee's earnings eligible for employer matching contribution. + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + 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 Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition Percentage of employer's matching contributions to a defined contribution plan that vests in a given year. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Details
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