Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2011

Employee Benefit Plans [Abstract]

Components of Net Periodic Benefit Cost

							Other Post-retirement
	Pension Benefits						Benefits
	2011			2010			2011			2010
	(in thousands)
Service cost	$	3,440		$	1,711		$	—		$	—
Interest cost		24,807			23,055			123			143
Expected return on plan assets		(30,918	)		(28,564	)		—			—
Amortization of prior service credit		(1,720	)		(1,745	)		(168	)		(264	)
Amortization of actuarial loss		14,417			7,623			415			423
Net periodic benefit cost	$	10,026		$	2,080		$	370		$	302

Net periodic benefit cost included the following components for the nine months ended September 30:

							Other Post-retirement
	Pension Benefits						Benefits
	2011			2010			2011			2010
	(in thousands)
Service cost	$	9,822		$	9,216		$	—		$	—
Interest cost		72,948			71,598			356			455
Expected return on plan assets		(93,044	)		(85,582	)		—			—
Amortization of prior service credit		(5,223	)		(5,228	)		(698	)		(794	)
Amortization of actuarial loss		39,766			26,444			1,282			1,319
Net periodic benefit cost	$	24,269		$	16,448		$	940		$	980