RETIREMENT PLANS (Tables)

9 Months Ended

Sep. 30, 2020

RETIREMENT PLANS

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

	Three months ended
	September 30, 2020				September 30, 2019
	Pension benefits		Postretirement benefits		Pension benefits		Postretirement benefits
Operating expense
Service cost	$	(164)	$	32	$	447	$	37
Non-operating expense
Interest cost		603		45		841		40
Expected return on plan assets		(414)		—		(1,263)		—
Actuarial (gain)/ loss		(7)		(15)		7		(17)
Net periodic pension expense	$	18	$	62	$	32	$	60

	Nine months ended
	September 30, 2020				September 30, 2019
	Pension benefits		Postretirement benefits		Pension benefits		Postretirement benefits
Operating expense
Service cost	$	682	$	96	$	1,342	$	111
Non-operating expense
Interest cost		2,361		135		2,524		120
Expected return on plan assets		(2,730)		—		(3,790)		—
Actuarial (gain)/ loss		(21)		(45)		22		(51)
Net periodic pension expense	$	292	$	186	$	98	$	180