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EMPLOYEE BENEFIT PLANS Benefit Obligations, Plan Assets, and Funded Status (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Retirement Benefits [Abstract]      
Accumulated Benefit Obligation (ABO) at December 31 $ 92,375 $ 75,666  
PBO at beginning of year 96,160 87,186  
Service cost 4,328 3,845 $ 4,537
Interest cost 3,912 3,856 4,012
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant 735 709  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 5,562 5,328 5,260
Defined Benefit Plan, Amortization of Gain (Loss) $ 149 $ 31 15
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] 10906 2172  
Defined Benefit Plan, Benefit Obligation, Benefits Paid $ 3,005 $ 4,404  
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)
PBO at end of year 120,319 96,160 87,186
Plan assets at beginning of year 84,753 79,185  
Actual return on plan assets 7,875 4,115  
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant 735 709  
Company contributions 368 1,956  
Defined Benefit Plan, Plan Assets, Benefits Paid 3,005 4,404  
Plan assets at end of year 97,182 84,753 $ 79,185
Funded status (23,137) (11,407)  
Current liabilities (395) (364)  
Non-current liabilities (22,742) (11,043)  
Net pension liability at end of year (23,137) (11,407)  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax 2,508 (6,234)  
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) 7,283 2,796  
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) 6,456 3,192  
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax $ 2,508 $ (6,234)