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EMPLOYEE BENEFIT PLANS - Fair Value of Plan Assets (Details) - Defined benefit pension plan - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	$ 113,976	$ 100,969	$ 91,567
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	4,426	3,888
Equities - Global | Net asset value per share
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	24,868	17,549
Equities - United States | Net asset value per share
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	41,140	31,835
Equities - United States futures | Net asset value per share
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	(2,055)	(2,616)
Equities - International developed markets | Net asset value per share
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	16,382	8,920
Equities - International developed markets futures | Net asset value per share
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	(16,260)	(4,921)
Equities - International emerging markets | Net asset value per share
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	(3,363)	6,600
Equities - International emerging markets futures | Net asset value per share
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	7,024	(975)
Fixed income - Investment grade | Net asset value per share
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	27,095	25,703
Fixed income - High yield | Net asset value per share
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	177	10,056
Fixed income - Emerging markets | Net asset value per share
Employee Benefit Plans
Defined benefit plan, fair value of plan assets		2,664
Fixed income - Futures | Net asset value per share
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	(689)	(1,265)
Real estate | Net asset value per share
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	$ 15,231	$ 3,531

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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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