Pension Plans and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2013

Compensation And Retirement Disclosure [Abstract]

Net Periodic Benefit Cost for Defined Benefit Plans

Net periodic defined benefit cost for defined benefit plans consisted of the following:

	Pension benefits						Other postretirement benefits
	Three months ended September 30
	2013			2012			2013			2012
	(in thousands)
Service cost	$	6,090			7,387			186			167
Interest cost on projected benefit obligation		15,032			15,509			673			934
Expected return on plan assets		(21,838	)		(17,627	)		—			—
Amortization of prior service cost		(1,639	)		(1,640	)		(340	)		5
Amortization of net actuarial loss		10,269			9,291			90			133
Net periodic benefit cost	$	7,914			12,920			609			1,239

	Pension benefits						Other postretirement benefits
	Nine months ended September 30
	2013			2012			2013			2012
	(in thousands)
Service cost	$	18,270			22,162			557			501
Interest cost on projected benefit obligation		45,097			46,527			2,018			2,803
Expected return on plan assets		(65,515	)		(52,883	)		—			—
Amortization of prior service cost		(4,917	)		(4,919	)		(1,019	)		15
Amortization of net actuarial loss		30,807			27,874			270			398
Net periodic benefit cost	$	23,742			38,761			1,826			3,717