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Consolidated Statements Of Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Noncontrolling Interests [Member]
Common Stock, Dividends, Per Share, Cash Paid $ 0.3725        
Beginning Balance (in shares) at Dec. 31, 2017   65,494,333      
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Shares issued   174,144      
Ending Balance (in shares) at Mar. 31, 2018   65,668,477      
Beginning Balance at Dec. 31, 2017   $ 1,133,448 $ (8,090) $ 604,470  
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Equity compensation expense   1,798      
Issuance of common stock, net of issuance costs   232      
Payment of minimum tax withholdings for share-based payment awards   (3,929)      
Other comprehensive income $ 204   204    
Reclassification of excess income tax benefits     (1,742) 1,742  
Net income attributable to Avista Corporation shareholders 54,890     54,890  
Cash dividends paid (common stock)       (24,634)  
Ending Balance at Mar. 31, 2018 1,758,571 $ 1,131,549 (9,628) 636,468  
Beginning Balance Noncontrolling Interest at Dec. 31, 2017         $ 656
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Net income attributable to noncontrolling interests         66
Cash dividends paid to subsidiary noncontrolling interests         (540)
Ending Balance Noncontrolling Interest at Mar. 31, 2018         182
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Total Avista Corporation shareholders’ equity 1,758,389        
Total Avista Corporation shareholders’ equity $ 1,773,220        
Common Stock, Dividends, Per Share, Cash Paid $ 0.3875        
Beginning Balance (in shares) at Dec. 31, 2018 65,688,356 65,688,356      
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Shares issued   61,576      
Ending Balance (in shares) at Mar. 31, 2019 65,749,932 65,749,932      
Beginning Balance at Dec. 31, 2018 $ 1,774,045 $ 1,136,491 (7,866) 644,595  
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Equity compensation expense   4,452      
Issuance of common stock, net of issuance costs   190      
Payment of minimum tax withholdings for share-based payment awards   (891)      
Other comprehensive income 160   160    
Reclassification of excess income tax benefits     0 0  
Net income attributable to Avista Corporation shareholders 115,794     115,794  
Cash dividends paid (common stock)       (25,615)  
Ending Balance at Mar. 31, 2019 1,868,222 $ 1,140,242 $ (7,706) $ 734,774  
Beginning Balance Noncontrolling Interest at Dec. 31, 2018 825       825
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Net income attributable to noncontrolling interests         87
Cash dividends paid to subsidiary noncontrolling interests         0
Ending Balance Noncontrolling Interest at Mar. 31, 2019 912       $ 912
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Total Avista Corporation shareholders’ equity $ 1,867,310