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Business Segment Information (Tables)

9 Months Ended

Sep. 30, 2021

Segment Reporting Information, Additional Information [Abstract]

Schedule of Segment Reporting Information, by Segment

Segment information was as follows (in thousands):

Total assets (net of intercompany eliminations) as of:			September 30, 2021						December 31, 2020
Electric Utilities			$	3,267,074					$	3,120,928
Gas Utilities			5,052,898						4,376,204
Power Generation			398,915						404,220
Mining			76,791						77,085
Corporate and Other			114,712						110,349
Total assets			$	8,910,390					$	8,088,786

Three Months Ended September 30, 2021			External Operating Revenue									Inter-company Operating Revenue									Total Revenues
			Contract Customers			Other Revenues						Contract Customers			Other Revenues
Segment:
Electric Utilities			$	207,374		$	203					$	5,526		$	—					$	213,103
Gas Utilities			161,977			1,087						1,520			99						164,683
Power Generation			2,333			412						23,725			50						26,520
Mining			6,969			235						8,845			339						16,388
Inter-company eliminations			—			—						(39,616)			(488)						(40,104)
Total			$	378,653		$	1,937					$	—		$	—					$	380,590

Three Months Ended September 30, 2020			External Operating Revenue									Inter-company Operating Revenue									Total Revenues
			Contract Customers			Other Revenues						Contract Customers			Other Revenues
Segment:
Electric Utilities			$	194,941		$	224					$	5,677		$	—					$	200,842
Gas Utilities			141,275			863						1,601			190						143,929
Power Generation			1,528			414						24,521			55						26,518
Mining			6,568			777						8,100			(209)						15,236
Inter-company eliminations			—			—						(39,899)			(36)						(39,935)
Total			$	344,312		$	2,278					$	—		$	—					$	346,590

Nine Months Ended September 30, 2021			External Operating Revenue									Inter-company Operating Revenue									Total Revenues
			Contract Customers			Other Revenues						Contract Customers			Other Revenues
Segment:
Electric Utilities			$	604,966		$	2,619					$	17,859		$	—					$	625,444
Gas Utilities			743,663			4,745						4,559			285						753,252
Power Generation			8,006			1,219						71,656			150						81,031
Mining			20,658			718						23,093			1,020						45,489
Inter-company eliminations			—			—						(117,167)			(1,455)						(118,622)
Total			$	1,377,293		$	9,301					$	—		$	—					$	1,386,594

Nine Months Ended September 30, 2020			External Operating Revenue									Inter-company Operating Revenue									Total Revenues
			Contract Customers			Other Revenues						Contract Customers			Other Revenues
Segment:
Electric Utilities			$	518,641		$	2,074					$	17,466		$	—					$	538,181
Gas Utilities			655,386			7,083						3,153			190						665,812
Power Generation			4,625			1,206						72,609			166						78,606
Mining			20,062			1,477						23,855			463						45,857
Inter-company eliminations			—			—						(117,083)			(819)						(117,902)
Total			$	1,198,714		$	11,840					$	—		$	—					$	1,210,554

			Three Months Ended September 30,						Nine Months Ended September 30,
			2021			2020			2021			2020
Adjusted operating income:
Electric Utilities			$	57,608		$	52,083		$	114,989		$	121,726
Gas Utilities			17,257			18,147			139,336			139,253
Power Generation			10,323			8,738			32,842			31,489
Mining			4,908			3,505			11,813			9,992
Corporate and Other			(223)			(239)			(3,526)			(108)
Operating income			89,873			82,234			295,454			302,352
Interest expense, net			(38,018)			(36,041)			(113,820)			(107,039)
Impairment of investment			—			—			—			(6,859)
Other income (expense), net			1,560			(1,193)			1,635			(703)
Income tax (expense)			(5,253)			(4,651)			(6,333)			(25,484)
Net income			48,162			40,349			176,936			162,267
Net income attributable to non-controlling interest			(4,050)			(4,066)			(11,347)			(11,844)
Net income available for common stock			$	44,112		$	36,283		$	165,589		$	150,423

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- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8813-108599

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599

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