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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 | 34,193 | 21,465 |  |  |  | 34,193 | 21,465 |  |
Other comprehensive income (loss), net of tax (benefits) | 985 | 459 |  |  |  |  |  | 985 | 459
Issuance of common stock, net of expenses | (2,630) |  | $ (2,630) |  |  |  |  |  |
Issuance of common stock, net of expenses (in shares) |  |  | 162,000 |  |  |  |  |  |
Common stock dividends | (33,713) | (21,942) |  |  |  | (33,713) | (21,942) |  |
Ending Balance at Mar. 31, 2017 | 2,065,588 | 1,799,769 | $ 1,658,280 | $ 106,818 | 601,491 | 439,452 | 1,091,323 | (32,144) | 137
Ending Balance (in shares) at Mar. 31, 2017 |  |  | 108,745,000 | 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 | $ 40,247 | 27,475 |  |  |  | 40,247 | 27,475 |  |
Other comprehensive income (loss), net of tax (benefits) | (12,773) | 31 |  |  |  |  |  | (12,773) | 31
Issuance of common stock, net of expenses | 658 |  | $ 658 |  |  |  |  |  |
Issuance of common stock, net of expenses (in shares) |  |  | 53,000 |  |  |  |  |  |
Common stock dividends | (33,741) | (25,826) |  |  |  | (33,741) | (25,826) |  |
Common stock issuance expenses |  | (8) |  |  | (8) |  |  |  |
Ending Balance at Mar. 31, 2018 | $ 2,091,777 | $ 1,846,955 | $ 1,663,149 | $ 107,634 | $ 614,667 | $ 483,342 | $ 1,125,842 | $ (54,714) | $ (1,188)
Ending Balance (in shares) at Mar. 31, 2018 | 108,841,157 |  | 108,841,000 | 16,142,000 |  |  |  |  |

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