Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Components of net periodic benefit cost for pension and postretirement plans

The components of net periodic benefit cost for the pension plans are as follows:

	Pension Benefits
	Three Months Ended   June 30,						Six Months Ended   June 30,
	2018			2017			2018			2017
	(in thousands)
Service cost	$	84		$	89		$	169		$	177
Interest cost	211			236			421			471
Expected return on plan assets	(281		)	(283		)	(562		)	(565		)
Amortization of net actuarial loss/prior service cost	45			184			91			368
Net periodic cost recognized	$	59		$	226		$	119		$	451