Segment Information (Tables)

9 Months Ended

Sep. 30, 2020

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, 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	$	4,430,279	$	1,634,606	$	10,754	$	—	$	6,075,639
Capital expenditures	$	87,432	$	19,073	$	—	$	—	$	106,505

Three Months Ended
September 30, 2019	Electric		Gas		Other		Eliminations		Total
Operating revenues	$	241,237	$	33,599	$	—	$	—	$	274,836
Cost of sales	58,768		5,459		—		—		64,227
Gross margin	182,469		28,140		—		—		210,609
Operating, general and administrative	57,433		18,830		735		—		76,998
Property and other taxes	34,731		9,355		3		—		44,089
Depreciation and depletion	35,824		7,342		—		—		43,166
Operating income (loss)	54,481		(7,387)		(738)		—		46,356
Interest expense, net	(19,481)		(1,588)		(2,653)		—		(23,722)
Other (expense) income, net	(677)		(344)		612		—		(409)
Income tax (expense) benefit	(1,415)		(232)		1,092		—		(555)
Net income (loss)	$	32,908	$	(9,551)	$	(1,687)	$	—	$	21,670
Total assets	$	4,632,077	$	1,173,513	$	4,590	$	—	$	5,810,180
Capital expenditures	$	70,063	$	25,784	$	—	$	—	$	95,847

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	$	4,430,279	$	1,634,606	$	10,754	$	—	$	6,075,639
Capital expenditures	$	230,524	$	52,463	$	—	$	—	$	282,987

Nine Months Ended
September 30, 2019	Electric		Gas		Other		Eliminations		Total
Operating revenues	$	733,933	$	195,842	$	—	$	—	$	929,775
Cost of sales	178,423		57,283		—		—		235,706
Gross margin	555,510		138,559		—		—		694,069
Operating, general and administrative	174,544		60,803		3,569		—		238,916
Property and other taxes	104,612		28,569		7		—		133,188
Depreciation and depletion	107,595		22,171		—		—		129,766
Operating income (loss)	168,759		27,016		(3,576)		—		192,199
Interest expense, net	(58,301)		(4,599)		(8,123)		—		(71,023)
Other (expense) income	(1,458)		(874)		3,196		—		864
Income tax (expense) benefit	(4,937)		493		24,542		—		20,098
Net income	$	104,063	$	22,036	$	16,039	$	—	$	142,138
Total assets	$	4,632,077	$	1,173,513	$	4,590	$	—	$	5,810,180
Capital expenditures	$	186,155	$	56,719	$	—	$	—	$	242,874