PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables)

3 Months Ended

Mar. 31, 2021

POSTRETIREMENT BENEFIT PLANS

Summary of the components of net periodic benefit cost

	Three Months Ended March 31
	Supplemental				Postretirement
	Benefit Plan				Health Benefit Plan
	2021		2020		2021		2020
	(in thousands)
Service cost	$	—	$	—	$	48	$	47
Interest cost		1		3		107		144
Pension settlement expense(1)		—		89		—		—
Amortization of net actuarial (gain) loss(2)		2		4		(137)		(149)
Net periodic benefit cost(3)	$	3	$	96	$	18	$	42

(1) For the three months ended March 31, 2020, pension settlement expense for the supplemental benefit pension plan of $0.1 million (pre-tax), or $0.1 million (after-tax), was due to a $0.7 million benefit related to an officer retirement.

(2) The Company amortizes actuarial gains and losses over the average remaining active service period of the plan participants and does not use a corridor approach.

(3) Service cost is reported within operating expenses and the other components of net periodic benefit cost (including pension settlement expense) are reported within the other line item of other income (costs) in the consolidated statements of operations.