PENSION AND OTHER POSTRETIREMENT BENEFITS - ESTIMATED COSTS TO BE AMORTIZED (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Prior Service Cost/(Credit)	$ 127
Net Actuarial Loss	6,202
Net Actuarial Loss	2,378
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Prior Service Cost/(Credit)	(257)
Net Actuarial Loss	1,040
Net Actuarial Loss	$ 0