Pension and Postretirement Benefits Other Than Pension Plans (Tables)

9 Months Ended

Sep. 30, 2018

Pension Plan [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Net Periodic Pension and Postretirement Benefit (Income) Expense

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

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Interest cost	$	808	$	891	$	2,422	$	2,706
Expected return on plan assets		(1,087)		(1,051)		(3,259)		(3,098)
Amortization of net actuarial loss		259		282		778		861
Net settlement loss		1,004		1,218		1,004		1,218
Total net periodic pension expense	$	984	$	1,340	$	945	$	1,687

Other Postretirement Benefit Plan [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

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				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Interest cost	$	24	$	27	$	72	$	81
Amortization of net actuarial loss		64		61		193		184
Amortization of prior service credit		(329)		(328)		(986)		(985)
Total net postretirement benefit income	$	(241)	$	(240)	$	(721)	$	(720)