Business Segment Information (Tables)

3 Months Ended

Mar. 31, 2020

Segment Reporting Information, Additional Information [Abstract]

Segment Reporting

Segment and Corporate and Other information is as follows (in thousands):

Three Months Ended March 31, 2020	External Operating Revenue				Inter-company Operating Revenue						Total Revenues
	Contract Customers		Other Revenues		Contract Customers			Other Revenues
Segment:
Electric Utilities	$	167,503	$	223	$	6,413		$	—		$	174,139
Gas Utilities	354,287		5,708		778			—			360,773
Power Generation	1,855		443		23,612			56			25,966
Mining	6,564		467		7,839			335			15,205
Inter-company eliminations	—		—		(38,642		)	(391		)	(39,033		)
Total	$	530,209	$	6,841	$	—		$	—		$	537,050

Three Months Ended March 31, 2019	External Operating Revenue					Inter-company Operating Revenue						Total Revenues
	Contract Customers		Other Revenues			Contract Customers			Other Revenues
Segment:
Electric Utilities	$	176,663	$	254		$	6,010		$	—		$	182,927
Gas Utilities	411,500		(1,119		)	699			—			411,080
Power Generation	2,257		436			21,890			662			25,245
Mining	7,550		269			8,279			331			16,429
Inter-company eliminations	—		—			(36,878		)	(993		)	(37,871		)
Total	$	597,970	$	(160	)	$	—		$	—		$	597,810

	Three Months Ended March 31,
	2020			2019
Adjusted operating income (a):
Electric Utilities	$	35,650		$	41,020
Gas Utilities	102,897			103,314
Power Generation	11,349			11,967
Mining	3,129			4,337
Corporate and Other	160			(507		)
Operating income	153,185			160,131
Interest expense, net	(35,453		)	(34,717		)
Impairment of investment	(6,859		)	—
Other income (expense), net	2,353			(789		)
Income tax (expense)	(16,002		)	(17,263		)
Net income	97,224			107,362
Net income attributable to noncontrolling interest	(4,050		)	(3,554		)
Net income available for common stock	$	93,174		$	103,808

__________

(a)

Adjusted operating income recognizes intersegment revenues and costs for Colorado Electric’s PPA with Black Hills Colorado IPP on an accrual basis rather than as a finance lease. This presentation of segment information does not impact consolidated financial results.

Reconciliation of Assets from Segment to Consolidated

Segment and Corporate and Other balances included in the accompanying Condensed Consolidated Balance Sheets were as follows (in thousands):

Total assets (net of inter-company eliminations) as of:	March 31, 2020		December 31, 2019
Segment:
Electric Utilities	$	2,931,902	$	2,900,983
Gas Utilities	4,043,539		4,032,339
Power Generation	412,572		417,715
Mining	80,289		77,175
Corporate and Other	180,512		130,245
Total assets	$	7,648,814	$	7,558,457