Employee Benefit Plans (Tables)

6 Months Ended

Jun. 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 June 30,						Six Months Ended June 30,
(Dollars in thousands)	2012			2011			2012			2011
Interest cost on benefit obligation	$	17,582		$	17,685		$	35,084		$	35,655
Expected return on plan assets	(21,095		)	(21,426		)	(42,206		)	(42,968		)
Amortization of net loss	4,893			2,534			9,723			5,273
Net periodic benefit expense (income)	$	1,380		$	(1,207	)	$	2,601		$	(2,040	)
	Non-Qualified Pension Plans
	Three Months Ended June 30,						Six Months Ended June 30,
(Dollars in thousands)	2012			2011			2012			2011
Interest cost on benefit obligation	$	863		$	957		$	1,719		$	1,894
Amortization of net loss	242			182			523			339
Net periodic benefit expense	$	1,105		$	1,139		$	2,242		$	2,233

Postretirement Medical Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Components Of Net Periodic Benefit Expense (Income)

	Three Months Ended June 30,						Six Months Ended June 30,
(Dollars in thousands)	2012			2011			2012			2011
Service cost	$	417		$	316		$	840		$	721
Interest cost on benefit obligation	1,138			1,125			2,159			2,246
Amortization of prior service credit	(301		)	(303		)	(603		)	(606		)
Net periodic benefit expense	$	1,254		$	1,138		$	2,396		$	2,361