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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS Pension Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 100   $ 200  
Service cost 1,312 $ 1,049 2,659 $ 2,116
Interest cost 1,039 945 2,105 1,907
Expected return on plan assets (1,500) (1,343) (3,040) (2,711)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (12) (48) (24) (97)
Net periodic benefit cost 839 603 1,700 1,215
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Other Nonoperating Gains (Losses) $ (500) $ (500) $ (1,000) $ (900)