Segment Information (Tables)

9 Months Ended

Sep. 30, 2021

Segment Reporting Information [Line Items]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

Financial data for the business segments are as follows (in thousands):

Three Months Ended
September 30, 2021	Electric		Gas		Other		Eliminations		Total
Operating revenues	$	287,473	$	38,482	$	—	$	—	$	325,955
Cost of sales	89,375		9,284		—		—		98,659
Gross margin	198,098		29,198		—		—		227,296
Operating, general and administrative	60,621		20,429		(102)		—		80,948
Property and other taxes	34,066		9,504		2		—		43,572
Depreciation and depletion	38,634		8,478		—		—		47,112
Operating income (loss)	64,777		(9,213)		100		—		55,664
Interest expense, net	(20,429)		(1,640)		(1,214)		—		(23,283)
Other income (expense), net	3,348		2,016		(38)		—		5,326
Income tax (expense) benefit	(1,680)		725		(1,556)		—		(2,511)
Net income (loss)	$	46,016	$	(8,112)	$	(2,708)	$	—	$	35,196
Total assets	$	5,370,432	$	1,291,144	$	5,054	$	—	$	6,666,630
Capital expenditures	$	102,188	$	26,778	$	—	$	—	$	128,966

Three Months Ended
September 30, 2020	Electric		Gas		Other		Eliminations		Total
Operating revenues	$	244,155	$	36,455	$	—	$	—	$	280,610
Cost of sales	61,155		6,883		—		—		68,038
Gross margin	183,000		29,572		—		—		212,572
Operating, general and administrative	54,367		20,059		(1,104)		—		73,322
Property and other taxes	35,532		9,772		2		—		45,306
Depreciation and depletion	36,670		7,619		—		—		44,289
Operating income (loss)	56,431		(7,878)		1,102		—		49,655
Interest expense, net	(21,286)		(1,574)		(817)		—		(23,677)
Other income (expense), net	1,559		459		(1,233)		—		785
Income tax benefit	1,197		607		899		—		2,703
Net income (loss)	$	37,901	$	(8,386)	$	(49)	$	—	$	29,466
Total assets(1)	$	5,031,741	$	1,201,528	$	10,754	$	—	$	6,244,023
Capital expenditures	$	87,432	$	19,073	$	—	$	—	$	106,505

Nine Months Ended
September 30, 2021	Electric		Gas		Other		Eliminations		Total
Operating revenues	$	798,984	$	225,991	$	—	$	—	$	1,024,975
Cost of sales	218,802		92,335		—		—		311,137
Gross margin	580,182		133,656		—		—		713,838
Operating, general and administrative	176,411		60,873		1,629		—		238,913
Property and other taxes	108,050		30,281		6		—		138,337
Depreciation and depletion	115,858		25,038		—		—		140,896
Operating income (loss)	179,863		17,464		(1,635)		—		195,692
Interest expense, net	(62,007)		(4,550)		(3,709)		—		(70,266)
Other income	8,392		4,035		1,505		—		13,932
Income tax (expense) benefit	(2,369)		(1,505)		20		—		(3,854)
Net income (loss)	$	123,879	$	15,444	$	(3,819)	$	—	$	135,504
Total assets	$	5,370,432	$	1,291,144	$	5,054	$	—	$	6,666,630
Capital expenditures	$	253,588	$	57,572	$	—	$	—	$	311,160

Nine Months Ended
September 30, 2020	Electric		Gas		Other		Eliminations		Total
Operating revenues	$	706,718	$	178,507	$	—	$	—	$	885,225
Cost of sales	173,294		47,059		—		—		220,353
Gross margin	533,424		131,448		—		—		664,872
Operating, general and administrative	166,854		61,348		(4,160)		—		224,042
Property and other taxes	107,079		29,700		7		—		136,786
Depreciation and depletion	110,692		23,644		—		—		134,336
Operating income	148,799		16,756		4,153		—		169,708
Interest expense, net	(63,585)		(4,824)		(3,889)		—		(72,298)
Other income (expense)	3,131		863		(4,967)		—		(973)
Income tax benefit (expense)	2,609		(467)		3,085		—		5,227
Net income (loss)	$	90,954	$	12,328	$	(1,618)	$	—	$	101,664
Total assets(1)	$	5,031,741	$	1,201,528	$	10,754	$	—	$	6,244,023
Capital expenditures	$	230,524	$	52,463	$	—	$	—	$	282,987

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(1) Subsequent to the issuance of our Annual Report on Form 10-K for the year ended December 31, 2020, we determined that Total Assets - Electric and Total Assets - Gas had been incorrectly reported due to an error in the allocation methodology utilized to calculate assets by segment. As a result, the September 30, 2020 Total Assets - Electric and Total Assets - Gas amounts have been corrected from the amounts previously reported to reflect an increase of Total Assets - Electric and a decrease of Total Assets - Gas of $466.9 million. The correction had no impact on net income or the presentation of total assets on the consolidated balance sheets and was determined not to be material.