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BASIS OF PRESENTATION (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Basis of Presentation [Line Items]        
Other components of net periodic pension income $ 1,812 $ 2,069 $ 2,820 $ 4,148
Operating Income (Loss) [Member] | Adjustments for New Accounting Pronouncement [Member]        
Basis of Presentation [Line Items]        
Other components of net periodic pension income   2,069   4,148
Cost of Sales [Member] | Adjustments for New Accounting Pronouncement [Member]        
Basis of Presentation [Line Items]        
Other components of net periodic pension income   1,177   2,370
Selling, General and Administrative Expenses [Member] | Adjustments for New Accounting Pronouncement [Member]        
Basis of Presentation [Line Items]        
Other components of net periodic pension income   $ 892   $ 1,778