Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2014

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,
		2014		2013		2014		2013	2013
Components of Net Periodic Benefit Cost		($ in Thousands)
Pension Plan:
Service cost	$	2,975	$	2,975	$	8,925	$	8,925	$	12,078
Interest cost		1,790		1,548		5,370		4,643		6,237
Expected return on plan assets		(4,855)		(4,305)		(14,565)		(12,915)		(17,647)
Amortization of prior service cost		15		17		45		52		72
Amortization of actuarial loss		326		1,073		975		3,218		4,344
Total net periodic benefit cost	$	251	$	1,308	$	750	$	3,923	$	5,084
Postretirement Plan:
Interest cost	$	39	$	40	$	116	$	120	$	142
Amortization of actuarial gain		(9)		―		(26)		―		―
Total net periodic benefit cost	$	30	$	40	$	90	$	120	$	142