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Consolidated Statements Of Equity And Redeemable Noncontrolling Interests - USD ($)
$ in Thousands
Total
Common Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Noncontrolling Interests [Member]
Beginning Balance (in shares) at Dec. 31, 2014   62,243,374      
Shares issued through equity compensation plans   125,620      
Shares issued through Employee Investment Plan (401-K)   33,057      
Shares issued through sales agency agreements   0      
Shares repurchased   (89,400)      
Ending Balance (in shares) at Dec. 31, 2015   62,312,651      
Beginning Balance at Dec. 31, 2014   $ 999,960 $ (7,888) $ 491,599 $ (429)
Equity compensation expense   6,035      
Issuance of common stock through equity compensation plans   462      
Issuance of common stock through Employee Investment Plan (401-K)   1,099      
Issuance of common stock through sales agency agreements, net of issuance costs   0      
Payment of minimum tax withholdings for share-based payment awards   (1,832)      
Repurchase of common stock   (1,431)   (1,489)  
Purchase of subsidiary noncontrolling interests   0     0
Excess tax benefits   43      
Other comprehensive income (loss) $ 1,238   1,238    
Net income attributable to Avista Corporation shareholders 123,227     123,227  
Cash dividends paid (common stock)       (82,397)  
Net income attributable to noncontrolling interests         90
Ending Balance at Dec. 31, 2015 1,528,287 $ 1,004,336 (6,650) 530,940 (339)
Total Avista Corporation shareholders’ equity $ 1,528,626        
Shares issued through equity compensation plans   203,727      
Shares issued through Employee Investment Plan (401-K)   26,556      
Shares issued through sales agency agreements   1,645,000      
Shares repurchased   0      
Ending Balance (in shares) at Dec. 31, 2016 64,187,934 64,187,934      
Equity compensation expense   $ 7,065      
Issuance of common stock through equity compensation plans   624      
Issuance of common stock through Employee Investment Plan (401-K)   1,061      
Issuance of common stock through sales agency agreements, net of issuance costs   65,267      
Payment of minimum tax withholdings for share-based payment awards   (3,072)      
Repurchase of common stock   0   0  
Purchase of subsidiary noncontrolling interests   0     0
Excess tax benefits   0      
Other comprehensive income (loss) $ (918)   (918)    
Net income attributable to Avista Corporation shareholders 137,228     137,228  
Cash dividends paid (common stock)       (87,154)  
Net income attributable to noncontrolling interests         88
Ending Balance at Dec. 31, 2016 $ 1,648,476 $ 1,075,281 (7,568) 581,014 (251)
Beginning Balance (in shares) at Dec. 31, 2015   62,312,651      
Ending Balance (in shares) at Dec. 31, 2017 65,494,333 65,494,333      
Beginning Balance at Dec. 31, 2015 $ 1,528,287 $ 1,004,336 (6,650) 530,940 (339)
Issuance of common stock through sales agency agreements, net of issuance costs   120,000      
Ending Balance at Dec. 31, 2017 1,730,484 $ 1,133,448 (8,090) 604,470 656
Total Avista Corporation shareholders’ equity $ 1,648,727        
Beginning Balance (in shares) at Dec. 31, 2016 64,187,934 64,187,934      
Shares issued through equity compensation plans   214,925      
Shares issued through Employee Investment Plan (401-K)   21,474      
Shares issued through sales agency agreements   1,070,000      
Shares repurchased   0      
Ending Balance (in shares) at Dec. 31, 2017 65,494,333 65,494,333      
Beginning Balance at Dec. 31, 2016 $ 1,648,476 $ 1,075,281 (7,568) 581,014 (251)
Equity compensation expense   6,530      
Issuance of common stock through equity compensation plans   720      
Issuance of common stock through Employee Investment Plan (401-K)   939      
Issuance of common stock through sales agency agreements, net of issuance costs   54,721      
Payment of minimum tax withholdings for share-based payment awards   (3,552)      
Repurchase of common stock   0   0  
Purchase of subsidiary noncontrolling interests   (1,191)     891
Excess tax benefits   0      
Other comprehensive income (loss) (522)   (522)    
Net income attributable to Avista Corporation shareholders 115,916     115,916  
Cash dividends paid (common stock)       (92,460)  
Net income attributable to noncontrolling interests         16
Ending Balance at Dec. 31, 2017 1,730,484 $ 1,133,448 $ (8,090) $ 604,470 $ 656
Total Avista Corporation shareholders’ equity $ 1,729,828