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Condensed Consolidated Statements Of Equity And Redeemable Noncontrolling Interests (USD $)
In Thousands, except Share data
Common Stock [Member]
Accumulated Other Comprehensive Loss [Member]
Retained Earnings [Member]
Total Avista Corporation Stockholders' Equity [Member]
Noncontrolling Interests [Member]
Redeemable Noncontrolling Interests [Member]
Total
Beginning Balance at Dec. 31, 2009$ 778,647$ (2,350)$ 274,990 $ (673)$ 34,833 
Beginning Balance (in shares) at Dec. 31, 200954,836,781      
Equity compensation expense2,308      
Issuance of common stock1,733,788      
Issuance of common stock, net of issuance costs34,677      
Equity transactions of consolidated subsidiaries(621)      
Other comprehensive income (loss) 108    108
Net income attributable to Avista Corporation  66,696   66,696
Cash dividends paid (common stock)  (41,385)    
Total equity   1,106,490  1,105,871
Net income attributable to noncontrolling interests    481,954 
Other    6  
Purchase of subsidiary noncontrolling interests     (2,593) 
Valuation adjustments and other noncontrolling interests activity  (6,580)  8,959 
Ending Balance at Sep. 30, 2010815,011(2,242)293,721 (619)43,153 
Ending Balance (in shares) at Sep. 30, 201056,570,569      
Beginning Balance at Dec. 31, 2010827,592(4,326)302,518 (600)46,7221,125,784
Beginning Balance (in shares) at Dec. 31, 201057,119,723     57,119,723
Equity compensation expense2,718      
Issuance of common stock1,081,274      
Issuance of common stock, net of issuance costs21,216      
Equity transactions of consolidated subsidiaries(2,817)      
Other comprehensive income (loss) (13)    (13)
Net income attributable to Avista Corporation  75,621   75,621
Cash dividends paid (common stock)  (47,685)    
Total equity   1,170,918  1,170,388
Net income attributable to noncontrolling interests    951,852 
Other    (25)  
Purchase of subsidiary noncontrolling interests     (6,179) 
Valuation adjustments and other noncontrolling interests activity  (3,906)  9,675 
Ending Balance at Sep. 30, 2011$ 848,709$ (4,339)$ 326,548 $ (530)$ 52,070$ 1,170,918
Ending Balance (in shares) at Sep. 30, 201158,200,997     58,200,997