PENSION AND OTHER POSTRETIREMENT BENEFITS (Tables)

3 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Schedule of Net Periodic Benefit Cost

The following summarizes the components of net periodic benefit cost:

	Pension Benefits
	Three Months Ended June 30,
	2018			2017
Operating expenses:
Service cost	$	120		$	116
Interest expense:
Interest expense	1,155			1,063
Expected return on plan assets	(1,286		)	(1,264		)
Amortization of prior service cost	11			10
Actuarial loss	422			511
Net periodic pension cost	$	422		$	436

	Other Postretirement Benefits
	Three Months Ended June 30,
	2018			2017
Operating expenses:
Service cost	$	4		$	3
Interest expense:
Interest expense	83			84
Amortization of prior service cost	(177		)	(178		)
Actuarial loss	109			115
Net periodic pension cost	$	19		$	24