Segment Reporting (tables)

9 Months Ended

Sep. 30, 2012

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Three Months Ended Three Months Ended September 30,
				Non-Utility
Thousands	Utility			Gas Storage		Other		Total
2012
Net operating revenues	$	42,331		$	7,544	$	40	$	49,915
Depreciation and amortization	16,661			1,620		—		18,281
Income (loss) from operations	(8,439		)	3,624		19		(4,796		)
Net income (loss)	(11,853		)	1,255		40		(10,558		)
2011
Net operating revenues	$	41,034		$	6,710	$	39	$	47,783
Depreciation and amortization	15,875			1,574		—		17,449
Income (loss) from operations	(8,029		)	2,458		19		(5,552		)
Net income (loss)	(9,518		)	1,160		46		(8,312		)

	Six Months Ended Nine Months Ended September 30,
			Non-Utility
Thousands	Utility		Gas Storage		Other			Total
2012
Net operating revenues	$	236,921	$	22,219	$	122		$	259,262
Depreciation and amortization	49,477		4,853		—			54,330
Income from operations	76,072		9,567		70			85,709
Net income	28,250		3,185		23			31,458
Total assets at September 30, 2012	2,386,879		287,687		15,802			2,690,368
2011
Net operating revenues	$	230,244	$	19,211	$	68		$	249,523
Depreciation and amortization	47,735		4,569		—			52,304
Income from operations	77,762		7,191		10			84,963
Net income (loss)	31,702		3,163		(211		)	34,654
Total assets at September 30, 2011	2,291,531		253,478		22,831			2,567,840
Total assets at December 31, 2011	$	2,435,888	$	294,637	$	16,049		$	2,746,574