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Consolidated Statements Of Equity And Redeemable Noncontrolling Interests - USD ($)
$ in Thousands
Total
Common Stock [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Noncontrolling Interests [Member]
Beginning Balance (in shares) at Dec. 31, 2016   64,187,934      
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Shares issued   221,049      
Ending Balance (in shares) at Jun. 30, 2017   64,408,983      
Beginning Balance at Dec. 31, 2016   $ 1,075,281 $ (7,568) $ 581,014  
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Equity compensation expense   2,559      
Issuance of common stock, net of issuance costs   1,247      
Payment of minimum tax withholdings for share-based payment awards   (3,420)      
Other comprehensive income $ 366   366    
Reclassification of excess income tax benefits     0 0  
Net income attributable to Avista Corporation shareholders 83,887     83,887  
Cash dividends paid (common stock)       (46,193)  
Ending Balance at Jun. 30, 2017 1,686,894 $ 1,075,667 (7,202) 618,708  
Beginning Balance Noncontrolling Interest at Dec. 31, 2016         $ (251)
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Net income (loss) attributable to noncontrolling interests         (28)
Cash dividends paid to subsidiary noncontrolling interests         0
Ending Balance Noncontrolling Interest at Jun. 30, 2017         (279)
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Total Avista Corporation shareholders’ equity 1,687,173        
Total Avista Corporation shareholders’ equity $ 1,729,828        
Beginning Balance (in shares) at Dec. 31, 2017 65,494,333 65,494,333      
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Shares issued   193,159      
Ending Balance (in shares) at Jun. 30, 2018 65,687,492 65,687,492      
Beginning Balance at Dec. 31, 2017 $ 1,730,484 $ 1,133,448 (8,090) 604,470  
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Equity compensation expense   3,558      
Issuance of common stock, net of issuance costs   1,227      
Payment of minimum tax withholdings for share-based payment awards   (3,929)      
Other comprehensive income 408   408    
Reclassification of excess income tax benefits     (1,742) 1,742  
Net income attributable to Avista Corporation shareholders 80,467     80,467  
Cash dividends paid (common stock)       (49,101)  
Ending Balance at Jun. 30, 2018 1,762,707 $ 1,134,304 $ (9,424) $ 637,578  
Beginning Balance Noncontrolling Interest at Dec. 31, 2017 656       656
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Net income (loss) attributable to noncontrolling interests         133
Cash dividends paid to subsidiary noncontrolling interests         (540)
Ending Balance Noncontrolling Interest at Jun. 30, 2018 249       $ 249
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Total Avista Corporation shareholders’ equity $ 1,762,458