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Discontinued Operations Discontinued Operations (Tables)
 12 Months Ended
Dec. 31, 2017
Discontinued Operations [Abstract]  
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]
The following table presents amounts that were included in discontinued operations for the year ended December 31, 2015 (dollars in thousands):
 
2015
Revenues
$
—

Gain on sale of Ecova (1)
777

Transaction expenses and accelerated employee benefits
71

Gain on sale of Ecova, net of transaction expenses
706

 
 
Income before income taxes
706

Income tax benefit (2)
(4,441
)
Net income from discontinued operations
5,147

Net income attributable to noncontrolling interests
—

Net income from discontinued operations attributable to Avista Corp. shareholders
$
5,147