PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables)

3 Months Ended

Mar. 31, 2018

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS

Summary of the components of net periodic benefit cost

	Three Months Ended March 31
	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		1,015		1,240		27		26		209		265
Expected return on plan assets		(401)		(2,167)		—		—		—		—
Amortization of prior service credit		—		—		—		—		(23)		(47)
Pension settlement expense		654		1,957		—		—		—		—
Amortization of net actuarial loss(1)		778		886		20		20		76		173
Net periodic benefit cost	$	2,046	$	1,916	$	47	$	46	$	354	$	513

⁽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		1,015
Actuarial gain(1)		(3,487)
Benefits paid		(4,864)
Benefit obligations at March 31, 2018		130,081
Change in plan assets
Fair value of plan assets at December 31, 2017		124,831
Actual return on plan assets		402
Benefits paid		(4,864)
Fair value of plan assets at March 31, 2018		120,369
Funded status at period end(2)	$	(9,712)
Accumulated benefit obligation	$	130,081

⁽¹⁾ Primarily related to the impact of an increase in the discount rate at the March 31, 2018 remeasurement upon settlement compared to the discount rate at the December 31, 2017 measurement date.

⁽²⁾ Noncurrent liability recognized within pension and postretirement liabilities in the accompanying consolidated balance sheet at March 31, 2018.