Pension Benefits (Tables)

6 Months Ended

Jun. 30, 2016

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,
	2016			2015			2016			2015
	(in thousands)
Service cost	$	2,113		$	2,390		$	4,100		$	3,974
Interest cost	830			700			1,454			1,248
Expected return on plan assets that reduces periodic pension cost	(573		)	(597		)	(1,118		)	(1,091		)
Amortization of prior service cost	5			5			9			9
Amortization of net actuarial loss	419			571			791			743
Net periodic benefit cost	$	2,794		$	3,069		$	5,236		$	4,883