RETIREMENT PLANS (Tables)

6 Months Ended

Jun. 30, 2020

RETIREMENT PLANS

Schedule of components of the plan's net periodic pension cost

	Three months ended
	June 30, 2020				June 30, 2019
	Pension benefits		Postretirement benefits		Pension benefits		Postretirement benefits
Operating expense
Service cost	$	423	$	32	$	447	$	37
Non-operating expense
Interest cost		879		45		841		40
Expected return on plan assets		(1,158)		—		(1,263)		—
Actuarial (gain)/ loss		(7)		(15)		7		(17)
Net periodic pension expense	$	137	$	62	$	32	$	60

	Six months ended
	June 30, 2020				June 30, 2019
	Pension benefits		Postretirement benefits		Pension benefits		Postretirement benefits
Operating expense
Service cost	$	846	$	64	$	895	$	74
Non-operating expense
Interest cost		1,758		90		1,682		80
Expected return on plan assets		(2,316)		—		(2,527)		—
Actuarial (gain)/ loss		(14)		(30)		15		(34)
Net periodic pension expense	$	274	$	124	$	65	$	120