Pension and Postretirement Benefits Other Than Pension Plans (Tables)

6 Months Ended

Jun. 30, 2018

Pension Plan [Member]

Net Periodic Pension and Postretirement Benefit (Income) Expense

Net periodic pension (income) expense reflected in the accompanying condensed consolidated statements of operations included the following components for the respective periods (in thousands):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Interest cost	$	803		$	901		$	1,614		$	1,815
Expected return on plan assets		(1,070	)		(1,011	)		(2,172	)		(2,047	)
Amortization of net actuarial loss		264			297			519			579
Total net periodic pension (income) expense	$	(3	)	$	187		$	(39	)	$	347

Other Postretirement Benefit Plan [Member]

Net Periodic Pension and Postretirement Benefit (Income) Expense

Net postretirement benefit income reflected in the accompanying condensed consolidated statements of operations included the following components for the respective periods (in thousands):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Interest cost	$	24		$	28		$	48		$	54
Amortization of net actuarial loss		65			66			129			123
Amortization of prior service credit		(329	)		(329	)		(657	)		(657	)
Total net postretirement benefit income	$	(240	)	$	(235	)	$	(480	)	$	(480	)