PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables)

9 Months Ended

Sep. 30, 2018

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS

Summary of the components of net periodic benefit cost

	Three Months Ended September 30
	Nonunion Defined				Supplemental				Postretirement
	Benefit Pension Plan				Benefit Plan				Health Benefit Plan
	2018		2017		2018		2017		2018		2017
	(in thousands)
Service cost	$	—	$	—	$	—	$	—	$	92	$	122
Interest cost		1,136		1,073		27		26		209		265
Expected return on plan assets		(363)		(763)		—		—		—		—
Amortization of prior service credit		—		—		—		—		(23)		(47)
Pension settlement expense		518		943		—		—		—		—
Amortization of net actuarial loss(1)		494		703		20		20		76		173
Net periodic benefit cost	$	1,785	$	1,956	$	47	$	46	$	354	$	513

	Nine Months Ended September 30
	Nonunion Defined				Supplemental				Postretirement
	Benefit Pension Plan				Benefit Plan				Health Benefit Plan
	2018		2017		2018		2017		2018		2017
	(in thousands)
Service cost	$	—	$	—	$	—	$	—	$	275	$	366
Interest cost		3,259		3,462		81		77		628		795
Expected return on plan assets		(1,142)		(4,984)		—		—		—		—
Amortization of prior service credit		—		—		—		—		(70)		(142)
Pension settlement expense		1,603		3,644		—		—		—		—
Amortization of net actuarial loss(1)		1,864		2,346		60		61		228		520
Net periodic benefit cost	$	5,584	$	4,468	$	141	$	138	$	1,061	$	1,539

⁽¹⁾ The Company amortizes actuarial losses over the average remaining active service period of the plan participants and does not use a corridor approach.

Schedule of changes in the projected benefit obligation and plan assets of the nonunion defined benefit pension plan

	Nonunion Defined
	Benefit Pension Plan
	(in thousands)
Change in benefit obligations
Benefit obligations at December 31, 2017	$	137,417
Interest cost		3,259
Actuarial loss(1)		3,562
Benefits paid		(11,781)
Benefit obligations at September 30, 2018		132,457
Change in plan assets
Fair value of plan assets at December 31, 2017		124,831
Actual return on plan assets		2,028
Employer contributions		5,500
Benefits paid		(11,781)
Fair value of plan assets at September 30, 2018		120,578
Funded status at period end(2)	$	(11,879)
Accumulated benefit obligation	$	132,457

⁽¹⁾ Actuarial loss resulted from remeasurement of the benefit obligation for plan termination assumptions at September 30, 2018, partially offset an actuarial gain recognized as of June 30, 2018 related primarily to the impact of an increase in the discount rate at the June 30, 2018 remeasurement upon settlement compared to the discount rate at the December 31, 2017 measurement date.

⁽²⁾ Recognized within current portion of pension and postretirement liabilities in the accompanying consolidated balance sheet at September 30, 2018.