Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2013

Retirement Plans [Abstract]

Net period benefit cost for the pension and postretirement plans

		Three Months Ended				Nine Months Ended			Year Ended
		September 30,				September 30,			December 31,
		2013		2012		2013		2012	2012
Components of Net Periodic Benefit Cost		($ in Thousands)
Pension Plan:
Service cost	$	2,975	$	2,613	$	8,925	$	7,838	$	10,287
Interest cost		1,548		1,613		4,643		4,838		6,547
Expected return on plan assets		(4,305)		(3,558)		(12,915)		(10,673)		(14,713)
Amortization of prior service cost		17		17		52		52		72
Amortization of actuarial loss		1,073		640		3,218		1,920		2,708
Settlement Charge		―		―		―		―		408
Total net periodic benefit cost	$	1,308	$	1,325	$	3,923	$	3,975	$	5,309
Postretirement Plan:
Interest cost	$	40	$	47	$	120	$	142	$	182
Amortization of prior service cost		―		43		―		128		170
Total net periodic benefit cost	$	40	$	90	$	120	$	270	$	352