Pension And Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2011

Pension Benefits [Member]

Components Of Net Periodic Benefit Cost

	Pension Benefits
	Three Months Ended September 30,						Nine Months Ended September 30,
	2011			2010			2011			2010
Components of net periodic benefit cost
Service cost	$	97		$	91		$	289		$	275
Interest cost		189			184			568			553
Expected return on assets		(165	)		(148	)		(493	)		(445	)
Amortization of:
Prior service cost		3			3			10			10
Unrecognized net loss		39			39			115			115
Net periodic benefit cost	$	163		$	169		$	489		$	508

Retiree Medical And Other Benefits [Member]

Components Of Net Periodic Benefit Cost

	Retiree Medical and Other Benefits
	Three Months Ended September 30,						Nine Months Ended September 30,
	2011			2010			2011			2010
Components of net periodic benefit cost
Service cost	$	15		$	15		$	45		$	45
Interest cost		44			41			132			124
Expected return on assets		(5	)		(4	)		(15	)		(13	)
Amortization of:
Prior service cost		(7	)		(4	)		(21	)		(14	)
Unrecognized net (gain) loss		(2	)		(2	)		(6	)		(7	)
Net periodic benefit cost	$	45		$	(46	)	$	135		$	135