Benefit Plans

3 Months Ended

Mar. 31, 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 March 31,
	2018			2017
	(Dollars in thousands)
Service cost	$	498		$	496
Interest cost	1,241			1,385
Expected return on plan assets	(1,502		)	(1,389		)
Net cost	$	237		$	492

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

	For the Three Months Ended March 31,
	2018		2017
	(Dollars in thousands)
Service cost	$	—	$	1
Interest cost	251		241
Net cost	$	251	$	242