Pension Benefits (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2017			2016
	(in thousands)
Service cost	$	2,050		$	1,987
Interest cost	727			624
Expected return on plan assets that reduces periodic pension cost	(559		)	(545		)
Amortization of prior service cost	4			4
Amortization of net actuarial loss	396			372
Net periodic benefit cost	$	2,618		$	2,442