PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables)

6 Months Ended

Jun. 30, 2017

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS

Summary of the components of net periodic benefit cost

	Three Months Ended June 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		1,149		1,158		25		33		265		255
Expected return on plan assets		(2,054)		(2,158)		—		—		—		—
Amortization of prior service credit		—		—		—		—		(48)		(48)
Pension settlement expense		744		564		—		—		—		—
Amortization of net actuarial loss(1)		757		1,061		21		38		174		176
Net periodic benefit cost	$	596	$	625	$	46	$	71	$	513	$	490

	Six Months Ended June 30
	Nonunion Defined				Supplemental				Postretirement
	Benefit Pension Plan				Benefit Plan				Health Benefit Plan
	2017		2016		2017		2016		2017		2016
	(in thousands)
Service cost	$	—	$	—	$	—	$	—	$	244	$	214
Interest cost		2,389		2,463		51		65		530		509
Expected return on plan assets		(4,221)		(4,104)		—		—		—		—
Amortization of prior service credit		—		—		—		—		(95)		(95)
Pension settlement expense		2,701		1,464		—		—		—		—
Amortization of net actuarial loss(1)		1,643		2,017		41		76		347		352
Net periodic benefit cost	$	2,512	$	1,840	$	92	$	141	$	1,026	$	980

⁽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		2,389
Actuarial loss(1)		4,929
Benefits paid		(17,461)
Benefit obligations at June 30, 2017		141,863
Change in plan assets
Fair value of plan assets at December 31, 2016		144,805
Actual return on plan assets		6,582
Benefits paid		(17,461)
Fair value of plan assets at June 30, 2017		133,926
Funded status at June 30, 2017(2)	$	(7,937)
Accumulated benefit obligation	$	141,863

⁽¹⁾ Impacted by 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 June 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 June 30, 2017.