Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2012

Defined Benefit Pension Plans [Member]

Defined Benefit Plan Disclosure [Line Items]

Components Of Net Periodic Benefit Expense (Income)

	Qualified Pension Plans						Non-Qualified Pension Plans
	Three Months Ended March 31,							Three Months Ended March 31,
(Dollars in thousands)	2012			2011				2012		2011
Interest cost on benefit obligation	$	17,502		$	17,970			$	856	$	937
Expected return on plan assets		(21,111	)		(21,542	)			--		--
Amortization of net loss		4,830			2,739				281		157
Net periodic benefit expense (income)	$	1,221		$	(833	)		$	1,137	$	1,094

Postretirement Medical Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Components Of Net Periodic Benefit Expense (Income)

	Three Months Ended March 31,
(Dollars in thousands)	2012			2011
Service cost	$	423		$	405
Interest cost on benefit obligation		1,021			1,121
Amortization of prior service credit		(302	)		(303	)
Net periodic benefit expense	$	1,142		$	1,223