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EMPLOYEE RETIREMENT PLANS - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) participant multiple denominator | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Maximum contribution percentage (in hundredths) | 90.00% |  |
Matching contribution limit (in hundredths) | 3.00% |  |
Contributions to the 401(k) Plan | $ 1,200,000 | $ 601,000 | $ 459,000
Initial prior service cost for retirement plan |  | 280,000 |
Prior service cost expected to be amortized in next fiscal year | $ 1,595,000 |  |
Supplemental Executive Retirement Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of participants | participant | 7 |  |
Factor used to determine annual base salary | multiple | 12 |  |
Annual base salary period (in months) | 24 months |  |
Age of participant (in years) | 65 years |  |
Minimum period of service (in years) | 20 years |  |
Benefit percentage, tier one (in hundredths) | 50.00% |  |
Benefit percentage, tier two (in hundredths) | 25.00% |  |
Benefit percentage, tier three (in hundredths) | 15.00% |  |
Minimum period of service for prorated benefit (in years) | 15 years |  |
Factor used to determine prorated benefit | denominator | 20 |  |
Installment period (in years) | 10 years |  |
Benefit percentage for special participants (in hundredths) | 50.00% |  |
Initial prior service cost for retirement plan | $ 20,400,000 |  |
Prior service cost expected to be amortized in next fiscal year | 3,200,000 |  |
Accumulated benefit obligation | $ 41,300,000 | $ 30,400,000 |
Defined benefit plan threshold of benefit obligation at which actuarial losses are amortized (in hundredths) | 10.00% |  |

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- Definition The threshold age of the employee, at which the participant may be eligible to receive a benefit, if the participant resigns or is terminated without cause at or after this age, and with a defined period of service. + References No definition available. + Details
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- Definition The period (in months) immediately preceding the participant's date of termination of employment, or, if required, the date of a change in control of the Company, used to determine the participant's annual base salary. + References No definition available. + Details
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- Definition The percentage of a special participant's annual base salary for the life of the participant (and their surviving spouse, if any), on which the benefit is based. + References No definition available. + Details
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- Definition The highest level of percentage of the participant's annual base salary for the life of the participant, on which the benefit is based, depending on the participant's benefit class. + References No definition available. + Details
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- Definition The lowest level of percentage of the participant's annual base salary for the life of the participant, on which the benefit is based, depending on the participant's benefit class. + References No definition available. + Details
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- Definition The multiple of the highest monthly base salary paid or payable to the participant during the defined period immediately preceding the participant's date of termination or employment, or, if required, the date of a change in control of the Company. This multiple is used to determine the participant's annual base salary. + References No definition available. + Details
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- Definition The threshold percentage of year end benefit obligation for which accumulation of actuarial losses in excess of this threshold are amortized from accumulated other comprehensive loss into net periodic pension cost over future years, based upon the average remaining service period of active plan participants. + References No definition available. + 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 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 Amount, after tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 + Details
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