Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Revenues:
Utility revenues, exclusive of alternative revenue programs	$ 393,241	$ 408,356
Alternative revenue programs	(4,658)	(5,939)
Total utility revenues	388,583	402,417
Non-utility revenues	7,898	6,944
Total operating revenues	396,481	409,361
Utility operating expenses:
Resource costs	137,347	154,618
Other operating expenses	83,978	77,298
Merger transaction costs	19,664	672
Depreciation and amortization	48,914	44,733
Taxes other than income taxes	31,943	30,829
Other non-utility operating expenses:
Other operating expenses	7,355	6,824
Depreciation and amortization	209	181
Total operating expenses	329,410	315,155
Income from operations	67,071	94,206
Interest expense	25,651	24,776
Interest Expense, Other	357	253
Capitalized interest	(928)	(968)
Merger termination fee	(103,000)	0
Other income-net	(907)	4,479
Income before income taxes	145,898	65,666
Income tax expense	30,017	10,710
Net income	115,881	54,956
Net income attributable to noncontrolling interests	(87)	(66)
Net income attributable to Avista Corporation shareholders	$ 115,794	$ 54,890
Weighted-average common shares outstanding (thousands), basic	65,733	65,639
Weighted-average common shares outstanding (thousands), diluted	65,941	65,931
Earnings per common share attributable to Avista Corporation shareholders:
Basic	$ 1.76	$ 0.84
Diluted	$ 1.76	$ 0.83