Commitments and Contingencies (tables)

12 Months Ended

Dec. 31, 2011

Commitments and Contingencies Disclosure Abstract

Long-term Purchase Commitment [Table Text Block]

					Pipeline		Pipeline
			Gas		Capacity		Capacity
			Purchase		Purchase		Release
Thousands			Agreements		Agreements		Agreements
2012		$	98,534	$	91,027	$	3,464
2013			18,331		87,983		-
2014			15,290		82,898		-
2015			5,651		72,316		-
2016			-		61,358		-
Thereafter			-		287,541		-
	Total		137,806		683,123		3,464
	Less: Amount representing interest		682		99,252		2
	Total at present value	$	137,124	$	583,871	$	3,462

Schedule Of Environmental Loss Contingencies By Site Text Block

			Current Liabilities				Non-Current Liabilities
Thousands			2011		2010		2011		2010
Gasco site		$	16,510	$	11,366	$	44,697	$	38,921
Siltronic site			887		720		128		201
Portland Harbor site			1,089		2,304		7,066		5,784
Central Service Center site			-		5		495		510
Front Street site			1,697		1		-		1,097
Other sites			-		-		120		108
	Total	$	20,183	$	14,396	$	52,506	$	46,621