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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 $ 1.1175        
Beginning Balance (in shares) at Dec. 31, 2017   65,494,333      
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Shares issued   193,667      
Ending Balance (in shares) at Sep. 30, 2018   65,688,000      
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   4,800      
Issuance of common stock, net of issuance costs   1,224      
Payment of minimum tax withholdings for share-based payment awards   (3,929)      
Other comprehensive income $ 612   612    
Reclassification of excess income tax benefits     (1,742) 1,742  
Net income attributable to Avista Corporation shareholders 90,586     90,586  
Cash dividends paid (common stock)       (73,569)  
Ending Balance at Sep. 30, 2018 $ 1,750,351 $ 1,135,543 (9,220) 623,229  
Beginning Balance Noncontrolling Interest at Dec. 31, 2017         $ 656
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Net income (loss) attributable to noncontrolling interests         143
Cash dividends paid to subsidiary noncontrolling interests         0
Deconsolidation of noncontrolling interests related to sale of METALfx         0
Ending Balance Noncontrolling Interest at Sep. 30, 2018         799
Common Stock, Dividends, Per Share, Cash Paid $ 0.3725        
Beginning Balance (in shares) at Jun. 30, 2018   65,687,492      
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Shares issued   508      
Ending Balance (in shares) at Sep. 30, 2018   65,688,000      
Beginning Balance at Jun. 30, 2018   $ 1,134,304 (9,424) 637,578  
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Equity compensation expense   1,242      
Issuance of common stock, net of issuance costs   (3)      
Payment of minimum tax withholdings for share-based payment awards   0      
Other comprehensive income $ 204   204    
Reclassification of excess income tax benefits     0 0  
Net income attributable to Avista Corporation shareholders 10,119     10,119  
Cash dividends paid (common stock)       (24,468)  
Ending Balance at Sep. 30, 2018 1,750,351 $ 1,135,543 (9,220) 623,229  
Beginning Balance Noncontrolling Interest at Jun. 30, 2018         249
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Net income (loss) attributable to noncontrolling interests         10
Cash dividends paid to subsidiary noncontrolling interests         540
Deconsolidation of noncontrolling interests related to sale of METALfx         0
Ending Balance Noncontrolling Interest at Sep. 30, 2018         799
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Total Avista Corporation shareholders’ equity 1,749,552        
Total Avista Corporation shareholders’ equity $ 1,773,220        
Common Stock, Dividends, Per Share, Cash Paid $ 1.1625        
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   1,020,633      
Ending Balance (in shares) at Sep. 30, 2019 66,708,989 66,708,989      
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   8,426      
Issuance of common stock, net of issuance costs   42,899      
Payment of minimum tax withholdings for share-based payment awards   (891)      
Other comprehensive income 483   483    
Reclassification of excess income tax benefits     0 0  
Net income attributable to Avista Corporation shareholders 146,203     146,203  
Cash dividends paid (common stock)       (76,772)  
Ending Balance at Sep. 30, 2019 1,893,568 $ 1,186,925 (7,383) 714,026  
Beginning Balance Noncontrolling Interest at Dec. 31, 2018 825       825
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Net income (loss) attributable to noncontrolling interests         (216)
Cash dividends paid to subsidiary noncontrolling interests         0
Deconsolidation of noncontrolling interests related to sale of METALfx         (609)
Ending Balance Noncontrolling Interest at Sep. 30, 2019 $ 0       0
Common Stock, Dividends, Per Share, Cash Paid $ 0.3875        
Beginning Balance (in shares) at Jun. 30, 2019   66,111,317      
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Shares issued   597,672      
Ending Balance (in shares) at Sep. 30, 2019 66,708,989 66,708,989      
Beginning Balance at Jun. 30, 2019   $ 1,157,024 (7,545) 734,555  
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Equity compensation expense   1,931      
Issuance of common stock, net of issuance costs   27,970      
Payment of minimum tax withholdings for share-based payment awards   0      
Other comprehensive income $ 162   162    
Reclassification of excess income tax benefits     0 0  
Net income attributable to Avista Corporation shareholders 5,090     5,090  
Cash dividends paid (common stock)       (25,619)  
Ending Balance at Sep. 30, 2019 1,893,568 $ 1,186,925 $ (7,383) $ 714,026  
Beginning Balance Noncontrolling Interest at Jun. 30, 2019         0
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Net income (loss) attributable to noncontrolling interests         0
Cash dividends paid to subsidiary noncontrolling interests         0
Deconsolidation of noncontrolling interests related to sale of METALfx         0
Ending Balance Noncontrolling Interest at Sep. 30, 2019 0       $ 0
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Total Avista Corporation shareholders’ equity $ 1,893,568