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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

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