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RETIREMENT PLANS - Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Plans      
Components of the plan's net periodic pension cost      
Service cost $ 1,794 $ 1,676 $ 1,308
Interest cost 3,279 3,388 2,002
Expected return on plan assets (4,835) (4,470) (2,024)
Amortization of actuarial (gain) loss 121 716 1,271
Curtailment     128
Net periodic pension cost 359 1,310 2,685
Postretirement Benefits      
Components of the plan's net periodic pension cost      
Service cost 147 183 97
Interest cost 161 206 97
Amortization of actuarial (gain) loss (67)    
Net periodic pension cost $ 241 $ 389 $ 194