Segment and Related Information (Tables)

12 Months Ended

Dec. 31, 2019

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

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

December 31, 2019	Electric			Gas			Other			Eliminations		Total
Operating revenues	$	981,178		$	276,732		$	—		$	—	$	1,257,910
Cost of sales	239,589			78,431			—			—		318,020
Gross margin	741,589			198,301			—			—		939,890
Operating, general and administrative	232,424			82,732			3,073			—		318,229
Property and other taxes	134,686			37,192			10			—		171,888
Depreciation and depletion	143,262			29,661			—			—		172,923
Operating income (loss)	231,217			48,716			(3,083		)	—		276,850
Interest expense, net	(78,809		)	(6,218		)	(10,041		)	—		(95,068		)
Other (expense) income, net	(1,365		)	(814		)	2,592			—		413
Income tax (expense) benefit	(6,079		)	493			25,511			—		19,925
Net income	$	144,964		$	42,177		$	14,979		$	—	$	202,120
Total assets	$	4,685,990		$	1,220,048		$	4,664		$	—	$	5,910,702
Capital expenditures	$	241,190		$	74,826		$	—		$	—	$	316,016

December 31, 2018	Electric			Gas			Other			Eliminations		Total
Operating revenues	$	921,093		$	270,916		$	—		$	—	$	1,192,009
Cost of sales	194,608			78,275			—			—		272,883
Gross margin	726,485			192,641			—			—		919,126
Operating, general and administrative	223,598			82,864			657			—		307,119
Property and other taxes	134,681			36,569			9			—		171,259
Depreciation and depletion	144,636			29,822			18			—		174,476
Operating income (loss)	223,570			43,386			(684		)	—		266,272
Interest expense, net	(79,033		)	(5,858		)	(7,097		)	—		(91,988		)
Other income, net	2,794			962			210			—		3,966
Income tax benefit (expense)	21,686			9,268			(12,244		)	—		18,710
Net income (loss)	$	169,017		$	47,758		$	(19,815	)	$	—	$	196,960
Total assets	$	4,512,392		$	1,127,252		$	4,732		$	—	$	5,644,376
Capital expenditures	$	221,968		$	61,998		$	—		$	—	$	283,966

December 31, 2017	Electric			Gas			Other			Eliminations		Total
Operating revenues	$	1,037,053		$	268,599		$	—		$	—	$	1,305,652
Cost of sales	334,029			76,320			—			—		410,349
Gross margin	703,024			192,279			—			—		895,303
Operating, general and administrative	216,003			78,757			43			—		294,803
Property and other taxes	127,391			35,214			9			—		162,614
Depreciation and depletion	136,556			29,548			33			—		166,137
Operating income (loss)	223,074			48,760			(85		)	—		271,749
Interest expense, net	(82,454		)	(5,920		)	(3,889		)	—		(92,263		)
Other (loss) income, net	(3,487		)	(878		)	950			—		(3,415		)
Income tax (expense) benefit	(7,424		)	(6,684		)	740			—		(13,368		)
Net income (loss)	$	129,709		$	35,278		$	(2,284	)	$	—	$	162,703
Total assets	$	4,346,484		$	1,071,847		$	2,586		$	—	$	5,420,917
Capital expenditures	$	226,077		$	50,361		$	—		$	—	$	276,438