Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2011

Pension Plans, Defined Benefit [Member]

Components Of Net Periodic Benefit Expense (Income)

	Qualified Pension Plans
	Three Months Ended June 30,						Six Months Ended June 30,
(Dollars in thousands)	2011			2010			2011			2010
Interest cost on benefit obligation	$	17,685		$	17,204		$	35,655		$	34,568
Expected return on plan assets		(21,426	)		(18,138	)		(42,968	)		(37,519	)
Amortization of net loss		2,534			2,307			5,273			4,535
Net periodic benefit expense (income)	$	(1,207	)	$	1,373		$	(2,040	)	$	1,584
	Non-Qualified Pension Plans
	Three Months Ended June 30,						Six Months Ended June 30,
(Dollars in thousands)		2011			2010			2011			2010
Interest cost on benefit obligation	$	957		$	966		$	1,894		$	1,940
Amortization of net loss		182			115			339			226
Net periodic benefit expense	$	1,139		$	1,081		$	2,233		$	2,166

Postretirement Medical Plan [Member]

Components Of Net Periodic Benefit Expense (Income)

	Three Months Ended June 30,						Six Months Ended June 30,
(Dollars in thousands)	2011			2010			2011			2010
Service cost	$	316		$	305		$	721		$	703
Interest cost on benefit obligation		1,125			1,195			2,246			2,416
Amortization of prior service credit		(303	)		(300	)		(606	)		(601	)
Net periodic benefit expense	$	1,138		$	1,200		$	2,361		$	2,518