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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
FAIR VALUE MEASUREMENTS
Defined Benefit Plan, Plan Assets, Amount	$ 15,940	$ 14,568	$ 13,009

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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