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EMPLOYEE BENEFIT PLANS - Periodic Benefit Cost and Other Changes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive loss:      
Total recognized in accumulated other comprehensive loss $ 23,445 $ (9,681) $ (31,122)
Defined benefit pension plan      
Components of net periodic benefit cost:      
Interest cost 3,438 4,185 4,864
Expected return on plan assets (6,580) (5,861) (4,932)
Amortization of prior service cost 186 186 186
Amortization of net loss 4,327 4,128 3,922
Net periodic benefit cost 1,371 2,638 4,040
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive loss:      
Net actuarial gain (loss) 14,921 (5,522) (7,350)
Reversal of amortization item: Prior service cost 186 186 186
Reversal of amortization item: Net actuarial loss 4,327 4,128 3,922
Total recognized in accumulated other comprehensive loss 19,434 (1,208) (3,242)
Net periodic benefit cost (1,371) (2,638) $ (4,040)
Total recognized in net periodic benefit cost and accumulated other comprehensive loss $ 18,063 $ (3,846)