Segment Information (Tables)

3 Months Ended

Mar. 31, 2015

Segment Information [Abstract]

Company's Segment Information, Continuing Operations

	Three Months Ended						Three Months Ended
	March 31, 2015						March 31, 2014
	Regulated		Other		Consolidated		Regulated		Other		Consolidated
Operating revenues	$	180,564	$	9,762	$	190,326	$	178,199	$	4,473	$	182,672
Operations and maintenance expense		67,018		6,171		73,189		68,456		3,230		71,686
Depreciation		30,438		62		30,500		30,881		100		30,981
Operating income		68,624		2,543		71,167		66,419		351		66,770
Interest expense, net of allowance for funds used during construction		16,720		763		17,483		16,804		1,339		18,143
Income tax expense (benefit)		4,367		227		4,594		6,087		(895)		5,192
Income (loss) from continuing operations		47,705		840		48,545		43,620		(1,219)		42,401
Capital expenditures		70,111		173		70,284		59,154		665		59,819

Company's Segment Information, Assets

	March 31,		December 31,
	2015		2014
Total assets:
Regulated	$	5,257,843	$	5,195,191
Other		219,889		211,561
Consolidated	$	5,477,732	$	5,406,752