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EMPLOYEE RETIREMENT PLANS AND POSTRETIREMENT BENEFITS - Defined Contribution Plan (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
EMPLOYEE RETIREMENT PLANS AND POSTRETIREMENT BENEFITS |  |  |
Defined Contribution Plan, vesting period | 4 years |  |
Matching contributions | 50.00% | 50.00% | 50.00%
Employer Matching Contribution, Percent of Employees' Gross Pay | 6.00% | 6.00% | 6.00%
Defined Contribution Plan, Cost | $ 2.6 | $ 1.6 | $ 1.4

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- Definition Represents the minimum period of credited service for vesting in the profit sharing contribution account under the defined contribution plans. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + 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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