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EMPLOYEE BENEFIT PLANS - Periodic Benefit Cost and Other Changes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive loss:      
Total defined benefit pension plan adjustments $ (9,681) $ (31,122) $ 5,069
Defined benefit pension plan      
Components of net periodic benefit cost:      
Interest cost 4,185 4,864 4,462
Expected return on plan assets (5,861) (4,932) (5,784)
Amortization of prior service cost 186 186 186
Amortization of net loss 4,128 3,922 3,608
Net periodic benefit cost 2,638 4,040 2,472
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive loss:      
Net actuarial gain (loss) (5,522) (7,350) (3,326)
Reversal of amortization item: Prior service cost 186 186 186
Reversal of amortization item: net actuarial loss 4,128 3,922 3,608
Total defined benefit pension plan adjustments (1,208) (3,242) 468
Net periodic benefit cost (2,638) (4,040) $ (2,472)
Total recognized in net periodic benefit cost and accumulated other comprehensive loss $ (3,846) $ (7,282)