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EMPLOYEE BENEFIT PLANS - Fair Value of Plan Assets (Details) - Defined benefit pension plan - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	$ 91,567	$ 75,823	$ 81,981
Cash And Cash Equivalents | Quoted Prices In Active Markets For Identical Assets (Level 1)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	2,958	5,277
Equities - Global | Net asset value per share
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	10,028
Equities - United States large-cap | Net asset value per share
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	19,220	21,862
Equities - United States small-cap | Net asset value per share
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	7,592	5,259
Equities - International developed markets | Net asset value per share
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	10,528	10,593
Equities - International emerging markets | Net asset value per share
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	8,410	4,808
Fixed income - Investment grade | Net asset value per share
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	26,186	15,777
Fixed income - High yield | Net asset value per share
Employee Benefit Plans
Defined benefit plan, fair value of plan assets		4,508
Real estate | Net asset value per share
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	4,355	5,034
Pension Plan assets - Other | Net asset value per share
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	$ 2,290	$ 2,705

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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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