Pension Benefits (Tables)

6 Months Ended

Jun. 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 June 30,						For the Six Months Ended June 30,
	2012			2011			2012			2011
	(in thousands)
Service cost	$	1,515		$	1,052		$	2,465		$	1,900
Interest cost	393			312			689			592
Expected return on plan assets that reduces periodic pension costs	(352		)	(281		)	(572		)	(440		)
Amortization of prior service costs	9			—			9			—
Amortization of net actuarial loss	293			111			394			202
Net periodic benefit cost	$	1,858		$	1,194		$	2,985		$	2,254