Segment Information (Tables)

9 Months Ended

Sep. 30, 2012

Segment Information [Abstract]

Results from Continuing Operations by Reportable Segment

To report income from continuing operations for regulated electric and regulated natural gas utility segments, the majority of costs are directly assigned to each segment. However, some costs, such as common depreciation, common operating and maintenance (O&M) expenses and interest expense are allocated based on cost causation allocators. A general allocator is used for certain general and administrative expenses, including office supplies, rent, property insurance and general advertising.

	Regulated		Regulated			All		Reconciling			Consolidated
(Thousands of Dollars)	Electric		Natural Gas			Other		Eliminations			Total
Three Months Ended Sept. 30, 2012
Operating revenues from external customers	$	214,426	$	11,742		$	307	$	-		$	226,475
Intersegment revenues		82		321			-		(403	)		-
Total revenues	$	214,508	$	12,063		$	307	$	(403	)	$	226,475
Net income (loss)	$	21,743	$	(1,461	)	$	1,918	$	-		$	22,200

	Regulated		Regulated			All		Reconciling			Consolidated
(Thousands of Dollars)	Electric		Natural Gas			Other		Eliminations			Total
Three Months Ended Sept. 30, 2011
Operating revenues from external customers	$	210,810	$	13,312		$	346	$	-		$	224,468
Intersegment revenues		83		212			-		(295	)		-
Total revenues	$	210,893	$	13,524		$	346	$	(295	)	$	224,468
Net income (loss)	$	21,178	$	(1,835	)	$	630	$	-		$	19,973

	Regulated		Regulated		All		Reconciling			Consolidated
(Thousands of Dollars)	Electric		Natural Gas		Other		Eliminations			Total
Nine Months Ended Sept. 30, 2012
Operating revenues from external customers	$	575,532	$	68,064	$	851	$	-		$	644,447
Intersegment revenues		278		585		-		(863	)		-
Total revenues	$	575,810	$	68,649	$	851	$	(863	)	$	644,447
Net income	$	39,118	$	992	$	2,710	$	-		$	42,820

	Regulated		Regulated		All		Reconciling			Consolidated
(Thousands of Dollars)	Electric		Natural Gas		Other		Eliminations			Total
Nine Months Ended Sept. 30, 2011
Operating revenues from external customers	$	573,870	$	86,675	$	881	$	-		$	661,426
Intersegment revenues		299		1,050		-		(1,349	)		-
Total revenues	$	574,169	$	87,725	$	881	$	(1,349	)	$	661,426
Net income	$	40,698	$	1,757	$	639	$	-		$	43,094