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Electric utility segment - Consolidating Statements of Changes in Common Stock Equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ 2,097,386 |  |  |  | $ 2,066,753 | $ 2,097,386 | $ 2,066,753 | $ 1,927,640
Net income for common stock | $ 49,573 | $ 65,900 | $ 46,054 | 40,247 | $ 32,370 | $ 60,073 | $ 38,661 | 34,193 | 201,774 | 165,297 | 248,256
Other comprehensive income (loss), net of tax benefits |  |  |  |  |  |  |  |  | (8,669) | (1,372) | (6,867)
Issuance of common stock, net of expenses |  |  |  |  |  |  |  |  |  |  | 26,844
Common stock dividends |  |  |  |  |  |  |  |  | (134,987) | (134,873) | (134,050)
Ending Balance | 2,162,280 |  |  |  | 2,097,386 |  |  |  | 2,162,280 | 2,097,386 | 2,066,753
Hawaiian Electric |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 1,845,283 |  |  |  | 1,799,787 | 1,845,283 | 1,799,787 | 1,728,325
Net income for common stock |  |  |  |  |  |  |  |  | 143,653 | 119,951 | 142,317
Other comprehensive income (loss), net of tax benefits |  |  |  |  |  |  |  |  | 1,318 | (688) | (1,247)
Issuance of common stock, net of expenses |  |  |  |  |  |  |  |  | 70,692 | 14,000 | 23,991
Common stock dividends |  |  |  |  |  |  |  |  | (103,305) | (87,767) | (93,599)
Ending Balance | 1,957,641 |  |  |  | 1,845,283 |  |  |  | 1,957,641 | 1,845,283 | 1,799,787
Hawaii Electric Light Company, Inc. (HELCO) |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 286,647 |  |  |  | 291,291 | 286,647 | 291,291 | 292,702
Net income for common stock |  |  |  |  |  |  |  |  | 24,481 | 20,146 | 21,255
Other comprehensive income (loss), net of tax benefits |  |  |  |  |  |  |  |  | 34 | 2 | (154)
Issuance of common stock, net of expenses |  |  |  |  |  |  |  |  | 1 | 4 | (5)
Common stock dividends |  |  |  |  |  |  |  |  | (15,289) | (24,796) | (22,507)
Ending Balance | 295,874 |  |  |  | 286,647 |  |  |  | 295,874 | 286,647 | 291,291
Maui Electric Company, Limited (MECO) |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 270,265 |  |  |  | 259,554 | 270,265 | 259,554 | 263,725
Net income for common stock |  |  |  |  |  |  |  |  | 20,912 | 17,911 | 21,136
Other comprehensive income (loss), net of tax benefits |  |  |  |  |  |  |  |  | 207 | (55) | (46)
Issuance of common stock, net of expenses |  |  |  |  |  |  |  |  | 1,498 | 4,801 | 0
Common stock dividends |  |  |  |  |  |  |  |  | (12,019) | (11,946) | (25,261)
Ending Balance | 280,863 |  |  |  | 270,265 |  |  |  | 280,863 | 270,265 | 259,554
Other subsidiaries |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 101 |  |  |  | 101 | 101 | 101 | 101
Net income for common stock |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other comprehensive income (loss), net of tax benefits |  |  |  |  |  |  |  |  | 0 | 0 | 0
Issuance of common stock, net of expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Common stock dividends |  |  |  |  |  |  |  |  | 0 | 0 | 0
Ending Balance | 101 |  |  |  | 101 |  |  |  | 101 | 101 | 101
Consolidating adjustments |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | (557,013) |  |  |  | (550,946) | (557,013) | (550,946) | (556,528)
Net income for common stock |  |  |  |  |  |  |  |  | (45,393) | (38,057) | (42,391)
Other comprehensive income (loss), net of tax benefits |  |  |  |  |  |  |  |  | (241) | 53 | 200
Issuance of common stock, net of expenses |  |  |  |  |  |  |  |  | (1,499) | (4,805) | 5
Common stock dividends |  |  |  |  |  |  |  |  | 27,308 | 36,742 | 47,768
Ending Balance | (576,838) |  |  |  | (557,013) |  |  |  | (576,838) | (557,013) | (550,946)
HECO Consolidated |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 1,845,283 |  |  |  | 1,799,787 | 1,845,283 | 1,799,787 | 1,728,325
Net income for common stock | 35,297 | $ 49,712 | $ 31,169 | $ 27,475 | 25,355 | $ 47,487 | $ 25,644 | $ 21,465 | 143,653 | 119,951 | 142,317
Other comprehensive income (loss), net of tax benefits |  |  |  |  |  |  |  |  | 1,318 | (688) | (1,247)
Issuance of common stock, net of expenses |  |  |  |  |  |  |  |  | 70,692 | 14,000 | 23,991
Common stock dividends |  |  |  |  |  |  |  |  | (103,305) | (87,767) | (93,599)
Ending Balance | $ 1,957,641 |  |  |  | $ 1,845,283 |  |  |  | $ 1,957,641 | $ 1,845,283 | $ 1,799,787

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