Quarterly report pursuant to Section 13 or 15(d)

PENSION AND POST RETIREMENT BENEFIT PLANS - Narrative (Details)

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PENSION AND POST RETIREMENT BENEFIT PLANS - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Retirement Benefits [Abstract]      
Company contributions to defined benefit plan $ 0 $ 0 $ 0