PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables)

9 Months Ended

Sep. 30, 2017

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
	2017		2016		2017		2016		2017		2016
	(in thousands)
Service cost	$	—	$	—	$	—	$	—	$	122	$	107
Interest cost		1,073		1,057		26		32		265		254
Expected return on plan assets		(763)		(2,242)		—		—		—		—
Amortization of prior service credit		—		—		—		—		(47)		(47)
Pension settlement expense		943		803		—		—		—		—
Amortization of net actuarial loss(1)		703		1,106		20		38		173		177
Net periodic benefit cost	$	1,956	$	724	$	46	$	70	$	513	$	491

	Nine Months Ended September 30
	Nonunion Defined				Supplemental				Postretirement
	Benefit Pension Plan				Benefit Plan				Health Benefit Plan
	2017		2016		2017		2016		2017		2016
	(in thousands)
Service cost	$	—	$	—	$	—	$	—	$	366	$	321
Interest cost		3,462		3,520		77		97		795		763
Expected return on plan assets		(4,984)		(6,346)		—		—		—		—
Amortization of prior service credit		—		—		—		—		(142)		(142)
Pension settlement expense		3,644		2,267		—		—		—		—
Amortization of net actuarial loss(1)		2,346		3,123		61		114		520		529
Net periodic benefit cost	$	4,468	$	2,564	$	138	$	211	$	1,539	$	1,471

⁽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, 2016	$	152,006
Interest cost		3,462
Actuarial loss(1)		6,672
Benefits paid		(23,325)
Benefit obligations at September 30, 2017		138,815
Change in plan assets
Fair value of plan assets at December 31, 2016		144,805
Actual return on plan assets		6,487
Benefits paid		(23,325)
Fair value of plan assets at September 30, 2017		127,967
Funded status at September 30, 2017(2)	$	(10,848)
Accumulated benefit obligation	$	138,815

⁽¹⁾ Related to actuarial increases in the valuation of participant data as of January 1, 2017 and the actuarial loss from remeasurement upon settlement which was impacted by a decrease in the discount rate at September 30, 2017 compared to the December 31, 2016 measurement date.

⁽²⁾ Noncurrent liability recognized within pension and postretirement liabilities in the accompanying consolidated balance sheet at September 30, 2017.