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Segments and Related Information (Tables)

12 Months Ended

Dec. 31, 2016

Segment Reporting [Abstract]

Results from Operations by Reportable Segment



(Thousands of Dollars)		Regulated Electric				Regulated Natural Gas				All Other				Reconciling Eliminations				Consolidated Total
2016
Operating revenues ^(a)		$	849,946			$	106,157			$	1,130			$	—			$	957,233
Intersegment revenues		397				487				—				(884		)		—
Total revenues		$	850,343			$	106,644			$	1,130			$	(884	)		$	957,233

Depreciation and amortization		$	81,299			$	16,794			$	201			$	—			$	98,294
Interest charges and financing costs		29,749				2,855				25				—				32,629
Income tax expense (benefit)		40,547				2,445				(90		)		—				42,902
Net income (loss)		65,002				4,503				(370		)		—				69,135



(Thousands of Dollars)		Regulated Electric				Regulated Natural Gas				All Other				Reconciling Eliminations				Consolidated Total
2015
Operating revenues ^(a)		$	834,998			$	120,147			$	1,396			$	—			$	956,541
Intersegment revenues		419				498				—				(917		)		—
Total revenues		$	835,417			$	120,645			$	1,396			$	(917	)		$	956,541

Depreciation and amortization		$	77,036			$	14,034			$	175			$	—			$	91,245
Interest charges and financing costs		26,494				2,637				90				—				29,221
Income tax expense		40,654				2,501				1,083				—				44,238
Net income		69,398				4,862				376				—				74,636



(Thousands of Dollars)		Regulated Electric				Regulated Natural Gas				All Other				Reconciling Eliminations				Consolidated Total
2014
Operating revenues ^(a)		$	829,748			$	169,629			$	1,085			$	—			$	1,000,462
Intersegment revenues		497				4,885				—				(5,382		)		—
Total revenues		$	830,245			$	174,514			$	1,085			$	(5,382	)		$	1,000,462

Depreciation and amortization		$	65,978			$	13,501			$	175			$	—			$	79,654
Interest charges and financing costs		23,448				2,358				107				—				25,913
Income tax expense (benefit)		39,621				5,993				(3,211		)		—				42,403
Net income		59,060				8,714				2,868				—				70,642


^(a)	Operating revenues include $170 million, $163 million and $145 million of intercompany revenue for the years ended Dec. 31, 2016, 2015 and 2014 respectively. See Note 15 for further discussion of related party transactions by operating segment.