Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2012

Defined Benefit Pension Plans [Member]

Defined Benefit Plan Disclosure [Line Items]

Components Of Net Periodic Benefit Expense (Income)

	Qualified Pension Plans
	Three Months Ended September 30,						Nine Months Ended September 30,
(Dollars in thousands)	2012			2011			2012			2011
Interest cost on benefit obligation	$	17,542		$	17,827		$	52,626		$	53,482
Expected return on plan assets	(21,102		)	(21,483		)	(63,308		)	(64,451		)
Amortization of net loss	4,862			2,636			14,585			7,909
Net periodic benefit expense (income)	$	1,302		$	(1,020	)	$	3,903		$	(3,060	)
	Non-Qualified Pension Plans
	Three Months Ended September 30,						Nine Months Ended September 30,
(Dollars in thousands)	2012			2011			2012			2011
Interest cost on benefit obligation	$	860		$	946		$	2,579		$	2,840
Amortization of net loss	240			170			763			509
Net periodic benefit expense	$	1,100		$	1,116		$	3,342		$	3,349

Postretirement Medical Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Components Of Net Periodic Benefit Expense (Income)

	Three Months Ended September 30,						Nine Months Ended September 30,
(Dollars in thousands)	2012			2011			2012			2011
Service cost	$	419		$	360		$	1,259		$	1,081
Interest cost on benefit obligation	1,080			1,123			3,239			3,369
Amortization of prior service credit	(302		)	(303		)	(905		)	(909		)
Net periodic benefit expense	$	1,197		$	1,180		$	3,593		$	3,541