EMPLOYEE BENEFIT PLANS - Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Investments at Net Asset Value:
Separate Investment Accounts	$ 78,883	$ 66,460
Pension Benefits
Investments at Net Asset Value:
Separate Investment Accounts	$ 78,883	$ 66,460

Defined Benefit Plan, Fair Value Of Plan Assets, Investments At Net Asset Fair Value

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant