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EMPLOYEE BENEFIT PLANS - Employee benefit plan amounts recognized in the Consolidated Balance Sheets and Consolidated Statements of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Retirement Benefits [Abstract]        
Service cost $ 2,334 $ 2,311 $ 4,759 $ 4,661
Interest cost 637 533 1,262 1,058
Expected return on plan assets (2,747) (2,538) (5,497) (5,088)
Amortization of prior service cost (75) (102) (150) (202)
Defined Benefit Plan, Amortization of Gain (Loss) 405 641 805 1,266
Net periodic benefit cost (income) $ 554 $ 845 $ 1,179 $ 1,695