Segment Information (Tables)

3 Months Ended

Mar. 31, 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
March 31, 2020	Electric			Gas			Other			Eliminations		Total
Operating revenues	$	244,625		$	90,630		$	—		$	—	$	335,255
Cost of sales	63,834			27,438			—			—		91,272
Gross margin	180,791			63,192			—			—		243,983
Operating, general and administrative	58,888			22,301			(2,184		)	—		79,005
Property and other taxes	34,736			9,761			2			—		44,499
Depreciation and depletion	37,176			8,089			—			—		45,265
Operating income	49,991			23,041			2,182			—		75,214
Interest expense, net	(20,816		)	(1,604		)	(1,914		)	—		(24,334		)
Other income (expense), net	613			95			(2,690		)	—		(1,982		)
Income tax benefit (expense)	656			(737		)	1,887			—		1,806
Net income (loss)	$	30,444		$	20,795		$	(535	)	$	—	$	50,704
Total assets	$	4,345,943		$	1,616,381		$	4,619		$	—	$	5,966,943
Capital expenditures	$	63,348		$	15,023		$	—		$	—	$	78,371

Three Months Ended
March 31, 2019	Electric			Gas			Other			Eliminations		Total
Operating revenues	$	273,037		$	111,183		$	—		$	—	$	384,220
Cost of sales	76,994			38,741			—			—		115,735
Gross margin	196,043			72,442			—			—		268,485
Operating, general and administrative	57,783			21,008			2,301			—		81,092
Property and other taxes	35,047			9,740			2			—		44,789
Depreciation and depletion	38,051			7,533			—			—		45,584
Operating income (loss)	65,162			34,161			(2,303		)	—		97,020
Interest expense, net	(19,535		)	(1,510		)	(2,745		)	—		(23,790		)
Other (expense) income, net	(561		)	(477		)	2,187			—		1,149
Income tax (expense) benefit	(1,809		)	1,079			(843		)	—		(1,573		)
Net income (loss)	$	43,257		$	33,253		$	(3,704	)	$	—	$	72,806
Total assets	$	4,544,043		$	1,151,929		$	4,683		$	—	$	5,700,655
Capital expenditures	$	52,307		$	13,270		$	—		$	—	$	65,577