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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ 2,066,753 |  |  |  | $ 1,927,640 | $ 2,066,753 | $ 1,927,640 | $ 1,790,573
Net income for common stock | $ 32,370 | $ 60,073 | $ 38,661 | 34,193 | $ 44,634 | $ 127,142 | $ 44,128 | 32,352 | 165,297 | 248,256 | 159,877
Other comprehensive income (loss), net of tax benefits |  |  |  |  |  |  |  |  | (1,372) | (6,867) | 1,116
Issuance of common stock, net of expenses |  |  |  |  |  |  |  |  |  | 26,844 |
Common stock dividends |  |  |  |  |  |  |  |  | (134,873) | (134,050) | (131,765)
Ending Balance | 2,097,386 |  |  |  | 2,066,753 |  |  |  | 2,097,386 | 2,066,753 | 1,927,640
Hawaiian Electric Company, Inc (HECO) |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 1,799,787 |  |  |  | 1,728,325 | 1,799,787 | 1,728,325 | 1,682,144
Net income for common stock |  |  |  |  |  |  |  |  | 119,951 | 142,317 | 135,714
Other comprehensive income (loss), net of tax benefits |  |  |  |  |  |  |  |  | (688) | (1,247) | 880
Issuance of common stock, net of expenses |  |  |  |  |  |  |  |  | 14,000 | 23,991 | (8)
Common stock dividends |  |  |  |  |  |  |  |  | (87,767) | (93,599) | (90,405)
Ending Balance | 1,845,283 |  |  |  | 1,799,787 |  |  |  | 1,845,283 | 1,799,787 | 1,728,325
Hawaii Electric Light Company, Inc. (HELCO) |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 291,291 |  |  |  | 292,702 | 291,291 | 292,702 | 281,846
Net income for common stock |  |  |  |  |  |  |  |  | 20,146 | 21,255 | 20,755
Other comprehensive income (loss), net of tax benefits |  |  |  |  |  |  |  |  | 2 | (154) | 122
Issuance of common stock, net of expenses |  |  |  |  |  |  |  |  | 4 | (5) | 0
Common stock dividends |  |  |  |  |  |  |  |  | (24,796) | (22,507) | (10,021)
Ending Balance | 286,647 |  |  |  | 291,291 |  |  |  | 286,647 | 291,291 | 292,702
Maui Electric Company, Limited (MECO) |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 259,554 |  |  |  | 263,725 | 259,554 | 263,725 | 256,692
Net income for common stock |  |  |  |  |  |  |  |  | 17,911 | 21,136 | 22,165
Other comprehensive income (loss), net of tax benefits |  |  |  |  |  |  |  |  | (55) | (46) | 44
Issuance of common stock, net of expenses |  |  |  |  |  |  |  |  | 4,801 | 0 | (1)
Common stock dividends |  |  |  |  |  |  |  |  | (11,946) | (25,261) | (15,175)
Ending Balance | 270,265 |  |  |  | 259,554 |  |  |  | 270,265 | 259,554 | 263,725
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 |  |  |  | (550,946) |  |  |  | (556,528) | (550,946) | (556,528) | (538,639)
Net income for common stock |  |  |  |  |  |  |  |  | (38,057) | (42,391) | (42,920)
Other comprehensive income (loss), net of tax benefits |  |  |  |  |  |  |  |  | 53 | 200 | (166)
Issuance of common stock, net of expenses |  |  |  |  |  |  |  |  | (4,805) | 5 | 1
Common stock dividends |  |  |  |  |  |  |  |  | 36,742 | 47,768 | 25,196
Ending Balance | (557,013) |  |  |  | (550,946) |  |  |  | (557,013) | (550,946) | (556,528)
HECO Consolidated |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 1,799,787 |  |  |  | 1,728,325 | 1,799,787 | 1,728,325 | 1,682,144
Net income for common stock | 25,355 | $ 47,487 | $ 25,644 | $ 21,465 | 34,119 | $ 46,974 | $ 35,857 | $ 25,367 | 119,951 | 142,317 | 135,714
Other comprehensive income (loss), net of tax benefits |  |  |  |  |  |  |  |  | (688) | (1,247) | 880
Issuance of common stock, net of expenses |  |  |  |  |  |  |  |  | 14,000 | 23,991 | (8)
Common stock dividends |  |  |  |  |  |  |  |  | (87,767) | (93,599) | (90,405)
Ending Balance | $ 1,845,283 |  |  |  | $ 1,799,787 |  |  |  | $ 1,845,283 | $ 1,799,787 | $ 1,728,325

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