ASSOCIATE BENEFIT PLANS (Tables)

9 Months Ended

Sep. 30, 2020

Postemployment Benefits [Abstract]

Schedule of Net Periodic Benefit Cost Components of Postretirement Benefits

The following table presents the components of net periodic benefit cost related to postretirement medical benefits plan.

	Three months ended September 30,				Nine months ended September 30,
(Dollars in thousands)	2020		2019		2020		2019
Service cost	$	15	$	13	$	45	$	40
Interest cost	17		20		51		58
Prior service cost amortization	(19)		(19)		(57)		(57)
Net gain recognition	(9)		(16)		(27)		(47)
Net periodic cost (benefit)	$	4	$	(2)	$	12	$	(6)

The following table presents the components of net periodic benefit cost related to the Alliance Associate Pension Plan.

	Three months ended September 30,				Nine months ended September 30,
(Dollars in thousands)	2020		2019		2020		2019
Service cost	$	—	$	10	$	17	$	30
Interest cost	—		70		105		208
Expected return on plan assets	—		(150)		(196)		(445)
Prior service cost amortization	—		—		—		—
Net gain recognition	—		—		—		—
Plan settlement loss	—		—		1,431		$	—
Net periodic cost (benefit)	$	—	$	(70)	$	1,357	$	(207)

The following table presents the components of net periodic benefit cost related to the Beneficial pension benefits and other postretirement benefit plans.

	Three months ended September 30, 2020				Nine months ended September 30, 2020
(Dollars in thousands)	Pension Benefits		Other Postretirement Benefits		Pension Benefits		Other Postretirement Benefits
Service cost	$	—	$	2	$	—	$	59
Interest cost	728		108		2,183		381
Expected return on plan assets	(1,590)		—		(4,773)		—
Prior service cost amortization	—		(76)		—		(76)
Net loss (gain) recognition	1		(6)		3		(15)
Net periodic (benefit) cost	$	(861)	$	28	$	(2,587)	$	349

	Three months ended September 30, 2019				Nine months ended September 30, 2019
(Dollars in thousands)	Pension Benefits		Other Postretirement Benefits		Pension Benefits		Other Postretirement Benefits
Service cost	$	—	$	23	$	—	$	53
Interest cost	857		177		1,999		413
Expected return on plan assets	(1,442)		—		(3,365)		—
Prior service cost amortization	—		—		—		—
Net loss (gain) recognition	—		—		—		—
Net periodic (benefit) cost	$	(585)	$	200	$	(1,366)	$	466