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EMPLOYEE BENEFIT PLANS Pension Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension and Other Postretirement Benefit Expense $ 4,827 $ (1,258) $ 7,803
Service cost 3,845 4,537 3,610
Interest cost 3,856 4,012 4,600
Expected return on plan assets (5,328) (5,260) (5,408)
Defined Benefit Plan, Amortization of Gains (Losses) (31) (15) (55)
Total net periodic pension cost 2,342 3,274 2,747
Defined Benefit Plan, Actuarial Gain (Loss) 2,756 (6,208) 7,448
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
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax (302) 1,661 (2,447)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax $ 2,485 (4,532) $ 5,056
Foreign Pension Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax   $ 1,661