Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2011

Pension Plans, Defined Benefit [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)	2011			2010			2011			2010
Interest cost on benefit obligation	$	17,827		$	17,284		$	53,482		$	51,852
Expected return on plan assets		(21,483	)		(18,760	)		(64,451	)		(56,279	)
Amortization of net loss		2,636			2,268			7,909			6,803
Net periodic benefit expense (income)	$	(1,020	)	$	792		$	(3,060	)	$	2,376
	Non-Qualified Pension Plans
	Three Months Ended September 30,						Nine Months Ended September 30,
(Dollars in thousands)		2011			2010			2011			2010
Interest cost on benefit obligation	$	946		$	969		$	2,840		$	2,909
Amortization of net loss		170			113			509			339
Net periodic benefit expense	$	1,116		$	1,082		$	3,349		$	3,248

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)	2011			2010			2011			2010
Service cost	$	360		$	351		$	1,081		$	1,054
Interest cost on benefit obligation		1,123			1,208			3,369			3,624
Amortization of prior service credit		(303	)		(301	)		(909	)		(902	)
Net periodic benefit expense	$	1,180		$	1,258		$	3,541		$	3,776