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BENEFIT PLANS - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Prior service costs [Abstract]      
Maximum percentage of net gain or loss over the greater of the projected benefit obligation or the market-related value of assets without requiring amortization 10.00%    
Pension Benefits [Member]      
Net periodic benefit cost [Abstract]      
Service cost $ 5,920 $ 5,750 $ 5,081
Interest cost 5,036 5,657 6,264
Expected return on plan assets (18,783) (16,306) (14,311)
Plan amendment 0 (637) 0
Amortization of unrecognized net loss 3,600 3,239 2,568
Amortization of prior service cost 379 241 64
Net periodic (benefit) (3,848) 2,056 (334)
Post-retirement Benefits [Member]      
Net periodic benefit cost [Abstract]      
Service cost 0 0 0
Interest cost 44 57 70
Expected return on plan assets 0 0 0
Plan amendment 0 0 0
Amortization of unrecognized net loss 45 40 38
Amortization of prior service cost (179) (179) (179)
Net periodic (benefit) $ (90) $ (82) $ (71)