Pension Benefits (Tables)

9 Months Ended

Sep. 30, 2012

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 both the Qualified Pension Plan and the Nonqualified Pension Plan:

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2012			2011			2012			2011
	(in thousands)
Service cost	$	1,232		$	950		$	3,697		$	2,850
Interest cost	345			296			1,034			888
Expected return on plan assets that reduces periodic pension costs	(286		)	(220		)	(858		)	(660		)
Amortization of prior service costs	4			—			13			—
Amortization of net actuarial loss	197			102			591			304
Net periodic benefit cost	$	1,492		$	1,128		$	4,477		$	3,382