Selected Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2019

Selected Quarterly Financial Information [Abstract]

Summary of Quarterly Operations

A summary of quarterly operations (in thousands, except per share amounts) for 2019 and 2018 follows:

	Three Months Ended
	March 31			June 30		September 30		December 31
2019
Operating revenues	$	396,481		$	300,812	$	283,770	$	364,559
Operating expenses	329,410			261,044		253,527		291,252
Income from operations	$	67,071		$	39,768	$	30,243	$	73,307
Net income	115,881			25,016		5,090		50,776
Less: Net income (loss) attributable to noncontrolling interests	(87		)	303		—		—
Net income attributable to Avista Corporation	$	115,794		$	25,319	$	5,090	$	50,776
Outstanding common stock:
Weighted average, basic	65,733			65,894		66,265		66,929
Weighted average, diluted	65,941			65,963		66,351		67,059
Earnings per common share attributable to Avista Corp. shareholders, diluted	$	1.76		$	0.38	$	0.08	$	0.76

	Three Months Ended
	March 31			June 30			September 30			December 31
2018
Operating revenues	$	409,361		$	319,298		$	296,013		$	372,221
Operating expenses	315,155			266,019			259,569			295,037
Income from operations	$	94,206		$	53,279		$	36,444		$	77,184
Net income	54,956			25,644			10,129			45,869
Less: Net loss attributable to noncontrolling interests	(66		)	(67		)	(10		)	(26		)
Net income attributable to Avista Corporation	$	54,890		$	25,577		$	10,119		$	45,843
Outstanding common stock:
Weighted average, basic	65,639			65,677			65,688			65,688
Weighted average, diluted	65,931			65,983			66,026			65,846
Earnings per common share attributable to Avista Corp. shareholders, diluted	$	0.83		$	0.39		$	0.15		$	0.70