Benefit Plans

9 Months Ended

Sep. 30, 2018

Retirement Benefits [Abstract]

Benefit Plans

Retirement Plans and Postretirement Benefits

The components of our consolidated net pension costs are set forth in the following table:

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2018			2017			2018			2017
	(Dollars in thousands)
Service cost	$	498		$	496		$	1,494		$	1,487
Interest cost	1,239			1,385			3,721			4,154
Expected return on plan assets	(1,502		)	(1,389		)	(4,506		)	(4,166		)
Net cost	$	235		$	492		$	709		$	1,475

The components of our consolidated net postretirement costs are set forth in the following table: 

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2018		2017		2018		2017
	(Dollars in thousands)
Service cost	$	3	$	1	$	3	$	1
Interest cost	229		241		731		724
Net cost	$	232	$	242	$	734	$	725