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EMPLOYEE BENEFIT PLANS Pension Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Retirement Benefits [Abstract]      
Pension and Other Postretirement Benefit Expense $ 8,910 $ 4,827 $ (1,258)
Service cost 4,328 3,845 4,537
Interest cost 3,912 3,856 4,012
Expected return on plan assets (5,562) (5,328) (5,260)
Defined Benefit Plan, Amortization of Gain (Loss) (149) (31) (15)
Total net periodic pension cost 2,529 2,342 3,274
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) 8,593 2,756 (6,208)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax 149 31 15
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax 8,742 2,787 (6,193)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax (2,361) (302) 1,661
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax $ 6,381 $ 2,485 $ (4,532)