Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2013

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Cost

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

	Pension Benefits						Other Post-retirement Benefits
	2013			2012			2013			2012
	(in thousands)
Service cost	$	4,798		$	3,801		$	—		$	—
Interest cost		22,219			25,030			32			66
Expected return on plan assets		(33,414	)		(32,098	)		—			—
Amortization of prior service credit		(1,884	)		(1,749	)		(239	)		(232	)
Amortization of actuarial loss		20,535			17,314			258			307
Net periodic benefit cost	$	12,254		$	12,298		$	51		$	141

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

	Pension Benefits						Other Post-retirement Benefits
	2013			2012			2013			2012
	(in thousands)
Service cost	$	14,735		$	11,452		$	—		$	—
Interest cost		67,017			75,299			107			200
Expected return on plan assets		(100,427	)		(96,260	)		—			—
Amortization of prior service credit		(5,670	)		(5,241	)		(717	)		(698	)
Amortization of actuarial loss		62,744			52,809			820			941
Net periodic benefit cost	$	38,399		$	38,059		$	210		$	443