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EMPLOYEE BENEFIT PLANS Benefit Obligations, Plan Assets, and Funded Status (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]      
Accumulated Benefit Obligation (ABO) at December 31 $ 75,666 $ 67,614  
PBO at beginning of year 87,186 106,325  
Service cost 3,845 4,537 $ 3,610
Interest cost 3,856 4,012 4,600
Defined Benefit Plan, Expected Return on Plan Assets 5,328 5,260 5,408
Defined Benefit Plan, Amortization of Gains (Losses) 31 15 55
Participant contributions $ 709 $ 735  
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] 2172 -6687  
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax $ 31 $ 15 55
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax 2,787 (6,193) 7,503
Benefits paid (4,404) (3,986)  
PBO at end of year 96,160 87,186 106,325
Plan assets at beginning of year 79,185 90,342  
Actual return on plan assets 4,115 4,781  
Company contributions 1,956 2,366  
Plan assets at end of year 84,753 79,185 $ 90,342
Funded status (11,407) (8,001)  
Current liabilities (364) (355)  
Non-current liabilities (11,043) (7,646)  
Net pension liability at end of year (11,407) (8,001)  
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax (5,333) (9,021)  
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss) 2,796 (17,750)  
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets 3,192 (15,053)  
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax $ (5,333) $ (9,021)