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EMPLOYEE BENEFIT PLANS - Component of net periodic benefit cost (Details) - Defined Benefit Pension Items [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Components of net periodic benefit cost      
Service cost $ 1,470 $ 1,482 $ 1,516
Interest cost 1,569 1,273 1,292
Expected return on plan assets (3,025) (2,798) (2,539)
Special termination benefit liability 0 63 0
Recognized net actuarial loss 1,649 1,548 1,454
Net periodic pension cost $ 1,663 $ 1,568 $ 1,723