Pension Benefits (Tables)

6 Months Ended

Jun. 30, 2017

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Components of the net periodic benefit cost for both the Qualified and the Nonqualified Pension Plan

The following table presents the components of the net periodic benefit cost for the Pension Plans:

	For the Three Months Ended   June 30,						For the Six Months Ended   June 30,
	2017			2016			2017			2016
	(in thousands)
Service cost	$	1,269		$	2,113		$	3,319		$	4,100
Interest cost	617			830			1,344			1,454
Expected return on plan assets that reduces periodic pension benefit cost	(563		)	(573		)	(1,122		)	(1,118		)
Amortization of prior service cost	5			5			9			9
Amortization of net actuarial loss	253			419			649			791
Net periodic benefit cost	$	1,581		$	2,794		$	4,199		$	5,236