PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables)

9 Months Ended

Sep. 30, 2016

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
	2016		2015		2016		2015		2016		2015
	(in thousands)
Service cost	$	—	$	—	$	—	$	—	$	107	$	101
Interest cost		1,057		1,356		32		31		254		228
Expected return on plan assets		(2,242)		(2,297)		—		—		—		—
Amortization of prior service credit		—		—		—		—		(47)		(47)
Pension settlement expense		803		762		—		—		—		—
Amortization of net actuarial loss(1)		1,106		640		38		40		177		213
Net periodic benefit cost	$	724	$	461	$	70	$	71	$	491	$	495

	Nine Months Ended September 30
	Nonunion Defined				Supplemental				Postretirement
	Benefit Pension Plan				Benefit Plan				Health Benefit Plan
	2016		2015		2016		2015		2016		2015
	(in thousands)
Service cost	$	—	$	—	$	—	$	—	$	321	$	304
Interest cost		3,520		3,899		97		92		763		685
Expected return on plan assets		(6,346)		(7,058)		—		—		—		—
Amortization of prior service credit		—		—		—		—		(142)		(142)
Pension settlement expense		2,267		2,478		—		—		—		—
Amortization of net actuarial loss(1)		3,123		2,276		114		120		529		639
Net periodic benefit cost	$	2,564	$	1,595	$	211	$	212	$	1,471	$	1,486

⁽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, 2015	$	159,607
Interest cost		3,520
Actuarial loss(1)		10,068
Benefits paid		(11,860)
Benefit obligations at September 30, 2016		161,335
Change in plan assets
Fair value of plan assets at December 31, 2015		136,917
Actual return on plan assets		9,637
Employer contributions		13,400
Benefits paid		(11,860)
Fair value of plan assets at September 30, 2016		148,094
Funded status at September 30, 2016(2)	$	(13,241)
Accumulated benefit obligation	$	161,335

⁽¹⁾ Actuarial loss from remeasurement upon settlement was primarily impacted by the change in the discount rate since the previous remeasurement date. The discount rates used to remeasure the PBO upon settlement were 2.7%,  2.7%,  3.0%, and 3.5% at the September 30, 2016, June 30, 2016, March 31, 2016, and December 31, 2015 measurement date, respectively.

⁽²⁾ Noncurrent liability recognized within pension and postretirement liabilities in the accompanying consolidated balance sheet at September 30, 2016.