Employee Benefit Plans (Tables)

9 Months Ended

Sep. 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 September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
	(in thousands)
Service cost	$	85		$	88		$	254		$	265
Interest cost	210			235			631			706
Expected return on plan assets	(281		)	(283		)	(843		)	(848		)
Amortization of net actuarial loss/prior service cost	46			184			137			552
Net periodic cost recognized	$	60		$	224		$	179		$	675