COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS (Tables)

6 Months Ended

Jun. 30, 2017

Pension Plan

Employee Benefit Plans

Components of net periodic benefit cost

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
	(in thousands)
Service cost	$	—	$	598	$	—	$	1,196
Interest cost		1,135		1,131		2,270		2,263
Expected return on plan assets		(1,251)		(1,287)		(2,503)		(2,574)
Amortization of prior service cost (1)		47		—		94		—
Amortization of net loss (1)		772		789		1,545		1,578
Net periodic benefit cost	$	703	$	1,231	$	1,406	$	2,463

(1) Amortization of prior service cost and net actuarial loss is included in the Operating expenses (excluding depreciation, depletion and amortization) line item within our condensed consolidated statements of income.