ASSOCIATE BENEFIT PLANS (Tables)

6 Months Ended

Jun. 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 June 30,				Six months ended June 30,
(Dollars in thousands)	2020		2019		2020		2019
Service cost	$	15	$	14	$	30	$	27
Interest cost	17		19		34		38
Prior service cost amortization	(19)		(19)		(38)		(38)
Net gain recognition	(9)		(16)		(18)		(31)
Net periodic cost (benefit)	$	4	$	(2)	$	8	$	(4)

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

	Three months ended June 30,				Six months ended June 30,
(Dollars in thousands)	2020		2019		2020		2019
Service cost	$	7	$	10	$	17	$	20
Interest cost	42		69		105		138
Expected return on plan assets	(79)		(148)		(196)		(295)
Prior service cost amortization	—		—		—		—
Net gain recognition	—		—		—		—
Plan settlement loss	1,431		$	—	1,431		$	—
Net periodic cost (benefit)	$	1,401	$	(69)	$	1,357	$	(137)

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 June 30, 2020				Six months ended June 30, 2020
(Dollars in thousands)	Pension Benefits		Other Postretirement Benefits		Pension Benefits		Other Postretirement Benefits
Service cost	$	—	$	29	$	—	$	58
Interest cost	740		138		1,455		275
Expected return on plan assets	(1,588)		—		(3,182)		—
Prior service cost amortization	—		—		—		—
Net loss (gain) recognition	1		(16)		2		(32)
Net periodic (benefit) cost	$	(847)	$	151	$	(1,725)	$	301

	Three months ended June 30, 2019				Six months ended June 30, 2019
(Dollars in thousands)	Pension Benefits		Other Postretirement Benefits		Pension Benefits		Other Postretirement Benefits
Service cost	$	—	$	23	$	—	$	30
Interest cost	857		177		1,142		236
Expected return on plan assets	(1,442)		—		(1,923)		—
Prior service cost amortization	—		—		—		—
Net loss (gain) recognition	—		—		—		—
Net periodic (benefit) cost	$	(585)	$	200	$	(781)	$	266