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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS Pension Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 100  
Service cost 1,149 $ 1,347
Interest cost 1,089 1,066
Expected return on plan assets (1,422) (1,540)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (16) (12)
Net periodic benefit cost 800 861
Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Other Nonoperating Gains (Losses) $ (300) $ (500)