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EMPLOYEE RETIREMENT PLANS AND POSTRETIREMENT BENEFITS - Fair Value of Plan Assets by Category (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Fair value of Plan Assets	$ 17,293	$ 14,903	$ 13,433
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of Plan Assets	15,189	13,704
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of Plan Assets	1,109	1,045
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of Plan Assets	995	154
Multi-asset Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of Plan Assets	$ 5,149	4,825
Investment percentage within Plan Asset category	29.80%
Multi-asset Fund [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of Plan Assets	$ 5,149	4,825
Diversified Growth Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of Plan Assets	$ 5,134	4,855
Investment percentage within Plan Asset category	29.70%
Diversified Growth Fund [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of Plan Assets	$ 5,134	4,855
Index-Linked Gilts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of Plan Assets		1,934
Index-Linked Gilts [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of Plan Assets		1,934
Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of Plan Assets	$ 4,906	2,090
Investment percentage within Plan Asset category	28.40%
Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of Plan Assets	$ 4,906	2,090
Insurance Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of Plan Assets	$ 1,109	1,045
Investment percentage within Plan Asset category	6.40%
Insurance Contract [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of Plan Assets	$ 1,109	1,045
Defined Benefit Plan, Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of Plan Assets	995	154
Defined Benefit Plan, Cash [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of Plan Assets	$ 995	$ 154

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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