RETIREMENT PLANS (Tables)

6 Months Ended

Jun. 30, 2021

RETIREMENT PLANS

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

	Three months ended
	June 30, 2021				June 30, 2020
	Pension benefits		Postretirement benefits		Pension benefits		Postretirement benefits
Operating expense
Service cost	$	54	$	35	$	423	$	32
Non-operating expense
Interest cost		572		41		879		45
Expected return on plan assets		(687)		—		(1,158)		—
Actuarial (gain)/ loss		—		—		(7)		(15)
Net periodic pension expense (benefit)	$	(61)	$	76	$	137	$	62

	Six months ended
	June 30, 2021				June 30, 2020
	Pension benefits		Postretirement benefits		Pension benefits		Postretirement benefits
Operating expense
Service cost	$	108	$	70	$	846	$	64
Non-operating expense
Interest cost		1,144		82		1,758		90
Expected return on plan assets		(1,374)		—		(2,316)		—
Actuarial (gain)/ loss		—		—		(14)		(30)
Net periodic pension expense	$	(122)	$	152	$	274	$	124