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Consolidated Balance Sheets (unaudited) (Parenthetical) - HECO - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Common stock, authorized shares (in shares) 200,000,000 200,000,000
Common stock, outstanding shares (in shares) 108,503,210 107,460,406
Hawaiian Electric Company, Inc. and Subsidiaries    
Nonutility property, plant and equipment, accumulated depreciation $ 1,231 $ 1,229
Common stock, par value (in dollars per share) $ 6.67 $ 6.67
Common stock, authorized shares (in shares) 50,000,000 50,000,000
Common stock, outstanding shares (in shares) 15,805,327 15,805,327