Pension and Postretirement Benefits Other Than Pension Plans (Tables)

6 Months Ended

Jun. 30, 2017

Pension Plan [Member]

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 June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
Interest cost	$	901		$	953		$	1,815		$	1,930
Expected return on plan assets		(1,011	)		(1,006	)		(2,047	)		(2,040	)
Amortization of net actuarial loss		297			322			579			614
Total net periodic pension expense	$	187		$	269		$	347		$	504

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 June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
Interest cost	$	28		$	30		$	54		$	60
Amortization of net actuarial loss		66			62			123			121
Amortization of prior service credit		(329	)		(329	)		(657	)		(657	)
Total net postretirement benefit income	$	(235	)	$	(237	)	$	(480	)	$	(476	)