Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2013

Retirement Plans [Abstract]

Net period benefit cost for the pension and postretirement plans

		Three Months Ended				Six Months Ended			Year Ended
		June 30,				June 30,			December 31,
		2013		2012		2013		2012	2012
Components of Net Periodic Benefit Cost		($ in Thousands)
Pension Plan:
Service cost	$	2,975	$	2,612	$	5,950	$	5,225	$	10,287
Interest cost		1,548		1,612		3,095		3,225		6,547
Expected return on plan assets		(4,305)		(3,557)		(8,610)		(7,115)		(14,713)
Amortization of prior service cost		17		18		35		35		72
Amortization of actuarial loss		1,073		640		2,145		1,280		2,708
Settlement Charge		―		―		―		―		408
Total net periodic benefit cost	$	1,308	$	1,325	$	2,615	$	2,650	$	5,309
Postretirement Plan:
Interest cost	$	40	$	48	$	80	$	95	$	182
Amortization of prior service cost		―		42		―		85		170
Total net periodic benefit cost	$	40	$	90	$	80	$	180	$	352