Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2011

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 six months ended
	June 30,				June 30,
		2011		2010		2011	2010
($ in thousands)
Components of net periodic pension benefit cost
Service cost	$	9,615	$	1,609	$	19,230	$           3,218
Interest cost on projected benefit obligation		21,172		12,381		42,344	24,762
Expected return on plan assets		(25,589)		(11,649)		(51,178)	(23,298)
Amortization of prior service cost /(credit)		(50)		(50)		(100)	(100)
Amortization of unrecognized loss		4,435		6,748		8,870	13,496
Net periodic pension benefit cost	$	9,583	$	9,039	$	19,166	$         18,078
	Postretirement Benefits				Postretirement Benefits
	Other Than Pensions (OPEB)				Other Than Pensions (OPEB)
		For the three months ended				For the six months ended
	June 30,					June 30,
		2011		2010		2011	2010
($ in thousands)
Components of net periodic postretirement benefit cost
Service cost	$	4,228	$	99	$	8,456	$              198
Interest cost on projected benefit obligation		6,328		2,629		12,656	5,258
Expected return on plan assets		(82)		(108)		(164)	(216)
Amortization of prior service cost/(credit)		(2,550)		(1,929)		(5,100)	(3,858)
Amortization of unrecognized loss		1,499		1,581		2,998	3,162
Net periodic postretirement benefit cost	$	9,423	$	2,272	$	18,846	$           4,544