Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2012

Retirement Plans [Abstract]

Net Periodic Benefit Cost

The following tables provide the components of net periodic benefit cost:

	Pension Benefits				Pension Benefits
	For the three months ended				For the nine months ended
	September 30,				September 30,
		2012		2011		2012		2011
($ in thousands)
Components of net periodic pension benefit cost
Service cost	$	11,782	$	9,615	$	32,766	$	28,844
Interest cost on projected benefit obligation		19,204		21,172		58,520		63,516
Expected return on plan assets		(23,655)		(25,589)		(71,833)		(76,766)
Amortization of prior service cost /(credit)		(50)		(50)		(150)		(150)
Amortization of unrecognized loss		6,845		4,435		22,419		13,306
Net periodic pension benefit cost	$	14,126	$	9,583	$	41,722	$	28,750
	Postretirement Benefits				Postretirement Benefits
	Other Than Pensions (OPEB)				Other Than Pensions (OPEB)
	For the three months ended				For the nine months ended
	September 30,					September 30,
		2012		2011		2012		2011
($ in thousands)
Components of net periodic postretirement benefit cost
Service cost	$	2,999	$	4,206	$	8,109	$	12,662
Interest cost on projected benefit obligation		4,462		5,986		13,382		18,642
Expected return on plan assets		(19)		(79)		(129)		(242)
Amortization of prior service cost/(credit)		(2,545)		(2,552)		(7,551)		(7,651)
Amortization of unrecognized loss		1,830		607		5,652		3,604
Net periodic postretirement benefit cost	$	6,727	$	8,168	$	19,463	$	27,015