EMPLOYEE BENEFITS (AOCI) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service cost	$ 0	$ 0
Unrecognized actuarial (gain) loss	53,616	60,571
Total amounts recognized in AOCI	53,616	60,571
Anticipated amortization of net actuarial losses in next fiscal year	3,603
Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service cost	(37,631)	(26,880)
Unrecognized actuarial (gain) loss	10,786	25,235
Total amounts recognized in AOCI	(26,845)	$ (1,645)
Anticipated amortization of net actuarial losses in next fiscal year	$ 894

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.

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