Commitments and Contingencies (tables)

9 Months Ended

Sep. 30, 2011

Commitments and Contingencies Disclosure Abstract

Schedule Of Environmental Loss Contingencies By Site Text Block

			Current Liabilities						Non-Current Liabilities
			Sept. 30,		Sept. 30,		Dec. 31,		Sept. 30,		Sept. 30,		Dec. 31,
Thousands			2011		2010		2010		2011		2010		2010
Gasco site		$	10,389	$	7,738	$	11,366	$	38,051	$	43,597	$	38,921
Siltronic site			721		746		720		114		275		201
Portland Harbor site			2,174		2,712		2,304		5,122		5,594		5,784
Central Service Center site			5		5		5		530		510		510
Front Street site			-		72		1		765		1,039		1,097
Other sites			-		-		-		129		110		108
	Total	$	13,289	$	11,273	$	14,396	$	44,711	$	51,125	$	46,621

Environmental Regulatory Assets [Text Block]

			Non-Current Regulatory Assets
			September 30,		September 30,		December 31,
Thousands			2011		2010		2010
Gasco site		$	79,823	$	72,531	$	74,205
Siltronic site			3,535		3,120		3,174
Portland Harbor site			35,889		33,316		33,940
Central Service Center site			610		551		553
Front Street site			2,130		2,000		2,020
Other sites			467		413		420
	Total	$	122,454	$	111,931	$	114,312