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EMPLOYEE BENEFIT PLANS Benefit Obligations, Plan Assets, and Funded Status (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Retirement Benefits [Abstract]      
Accumulated Benefit Obligation (ABO) at December 31 $ 78,746 $ 92,375  
PBO at beginning of year 120,319 96,160  
Service cost 5,242 4,328 $ 3,845
Interest cost 4,137 3,912 3,856
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant 745 735  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 5,969 5,562 5,328
Defined Benefit Plan, Amortization of Gain (Loss) $ 46 $ 149 31
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] -11643.715 10906  
Defined Benefit Plan, Benefit Obligation, Benefits Paid $ 3,892 $ 3,005  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax 46 149 31
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax (5,204) 8,742 2,787
PBO at end of year 105,515 120,319 96,160
Plan assets at beginning of year 97,182 84,753  
Actual return on plan assets (425) 7,875  
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant 745 735  
Company contributions 372 368  
Defined Benefit Plan, Plan Assets, Benefits Paid 3,892 3,005  
Plan assets at end of year 86,556 97,182 $ 84,753
Funded status (18,959) (23,137)  
Current liabilities (364) (395)  
Non-current liabilities (18,595) (22,742)  
Net pension liability at end of year (18,959) (23,137)  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax (2,696) 2,508  
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) (9,392) 7,283  
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) (7,426) 6,456  
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax $ (2,696) $ 2,508