Segment Information (Tables)

6 Months Ended

Jun. 30, 2012

Segment Information [Abstract]

Company's Segment Information, Continuing Operations

	Three Months Ended							Three Months Ended
	June 30, 2012							June 30, 2011
	Regulated		Other			Consolidated		Regulated		Other			Consolidated
Operating revenues	$	193,482	$	4,722		$	198,204	$	175,040	$	3,273		$	178,313
Operations and maintenance expense		64,225		2,755			66,980		63,784		2,981			66,765
Depreciation		29,014		(318	)		28,696		27,065		(515	)		26,550
Operating income		86,563		1,832			88,395		72,222		401			72,623
Interest expense, net of AFUDC		17,227		1,067			18,294		16,463		1,149			17,612
Income tax expense (benefit)		27,784		3			27,787		18,939		(385	)		18,554
Income (loss) from continuing operations		41,616		1,011			42,627		36,843		(248	)		36,595

	Six Months Ended							Six Months Ended
	June 30, 2012							June 30, 2011
	Regulated		Other			Consolidated		Regulated		Other			Consolidated
Operating revenues	$	359,907	$	8,541		$	368,448	$	335,696	$	6,232		$	341,928
Operations and maintenance expense		129,547		5,698			135,245		125,920		4,576			130,496
Depreciation		56,928		(637	)		56,291		53,682		(856	)		52,826
Operating income		149,084		2,390			151,474		132,034		1,509			133,543
Interest expense, net of AFUDC		34,152		2,046			36,198		32,821		2,170			34,991
Income tax expense (benefit)		46,372		(626	)		45,746		32,060		(490	)		31,570
Income (loss) from continuing operations		68,810		1,475			70,285		67,251		(10	)		67,241
Capitalexpenditures		171,046		378			171,424		140,399		877			141,276

Company's Segment Information, Assets

	June 30,		December 31,
	2012		2011
Total assets:
Regulated	$	4,211,877	$	4,186,639
Other and eliminations		208,370		161,781
Consolidated	$	4,420,247	$	4,348,420