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Condensed Consolidated Statements of Changes in Shareholders' Equity and Common Stock Equity (unaudited) - USD ($) $ in Thousands | Total | Hawaiian Electric Company, Inc. and Subsidiaries | Common stock | Common stock Hawaiian Electric Company, Inc. and Subsidiaries | Premium on capital stock Hawaiian Electric Company, Inc. and Subsidiaries | Retained Earnings | Retained Earnings Hawaiian Electric Company, Inc. and Subsidiaries | Accumulated other comprehensive income (loss) | Accumulated other comprehensive income (loss) Hawaiian Electric Company, Inc. and Subsidiaries
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2016 | $ 2,066,753 | $ 1,799,787 | $ 1,660,910 | $ 106,818 | $ 601,491 | $ 438,972 | $ 1,091,800 | $ (33,129) | $ (322)
Beginning Balance (in shares) at Dec. 31, 2016 |  |  | 108,583,000 | 16,020,000 |  |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |  |
Net income for common stock | 132,927 | 94,596 |  |  |  | 132,927 | 94,596 |  |
Other comprehensive income (loss), net of tax (benefits) | 3,909 | 521 |  |  |  |  |  | 3,909 | 521
Issuance of common stock, net of expenses | 582 |  | $ 582 |  |  |  |  |  |
Issuance of common stock, net of expenses (in shares) |  |  | 203,000 |  |  |  |  |  |
Common stock dividends (93¢ per share) | (101,149) | (65,825) |  |  |  | (101,149) | (65,825) |  |
Common stock issuance expenses |  | (4) |  |  | (4) |  |  |  |
Ending Balance at Sep. 30, 2017 | 2,103,022 | 1,829,075 | $ 1,661,492 | $ 106,818 | 601,487 | 470,750 | 1,120,571 | (29,220) | 199
Ending Balance (in shares) at Sep. 30, 2017 |  |  | 108,786,000 | 16,020,000 |  |  |  |  |
Beginning Balance at Dec. 31, 2017 | $ 2,097,386 | 1,845,283 | $ 1,662,491 | $ 107,634 | 614,675 | 476,836 | 1,124,193 | (41,941) | (1,219)
Beginning Balance (in shares) at Dec. 31, 2017 | 108,787,807 |  | 108,788,000 | 16,142,000 |  |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |  |
Net income for common stock | $ 152,201 | 108,356 |  |  |  | 152,201 | 108,356 |  |
Other comprehensive income (loss), net of tax (benefits) | (21,187) | 85 |  |  |  |  |  | (21,187) | 85
Issuance of common stock, net of expenses | 4,880 |  | $ 4,880 |  |  |  |  |  |
Issuance of common stock, net of expenses (in shares) |  |  | 91,000 |  |  |  |  |  |
Common stock dividends (93¢ per share) | (101,235) | (77,479) |  |  |  | (101,235) | (77,479) |  |
Common stock issuance expenses |  | (8) |  |  | (8) |  |  |  |
Ending Balance at Sep. 30, 2018 | $ 2,132,045 | $ 1,876,237 | $ 1,667,371 | $ 107,634 | $ 614,667 | $ 527,802 | $ 1,155,070 | $ (63,128) | $ (1,134)
Ending Balance (in shares) at Sep. 30, 2018 | 108,879,245 |  | 108,879,000 | 16,142,000 |  |  |  |  |

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