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Electric utility segment - Condensed consolidating statement of changes in common stock equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Increase (decrease) in stockholders' equity |  |  |  |
Beginning Balance |  |  | $ 2,097,386 | $ 2,066,753
Net income for common stock | $ 46,054 | $ 38,661 | 86,301 | 72,854
Other comprehensive income (loss), net of taxes | (3,825) | 2,370 | (16,598) | 3,355
Common stock dividends |  |  | (67,481) | (67,426)
Ending Balance | 2,103,018 | 2,075,029 | 2,103,018 | 2,075,029
Consolidating adjustments |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |
Beginning Balance |  |  | (557,013) | (550,946)
Net income for common stock | (9,080) | (7,936) | (18,405) | (16,539)
Other comprehensive income (loss), net of taxes | (1) | (2) | (1) | (1)
Common stock dividends |  |  | 13,654 | 13,721
Common stock issuance expenses |  |  | 1 | 1
Ending Balance | (561,764) | (553,764) | (561,764) | (553,764)
Hawaiian Electric (parent only) | Reportable Legal Entities |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |
Beginning Balance |  |  | 1,845,283 | 1,799,787
Net income for common stock | 31,169 | 25,644 | 58,644 | 47,109
Other comprehensive income (loss), net of taxes | 26 | 40 | 57 | 499
Common stock dividends |  |  | (51,652) | (43,884)
Common stock issuance expenses |  |  | (8) | (5)
Ending Balance | 1,852,324 | 1,803,506 | 1,852,324 | 1,803,506
HELCO | Reportable Legal Entities |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |
Beginning Balance |  |  | 286,647 | 291,291
Net income for common stock | 3,763 | 3,632 | 9,864 | 8,216
Other comprehensive income (loss), net of taxes | 1 | 1 | 1 | 1
Common stock dividends |  |  | (7,644) | (7,748)
Common stock issuance expenses |  |  | (3) | 0
Ending Balance | 288,865 | 291,760 | 288,865 | 291,760
Maui Electric | Reportable Legal Entities |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |
Beginning Balance |  |  | 270,265 | 259,554
Net income for common stock | 5,317 | 4,304 | 8,541 | 8,323
Other comprehensive income (loss), net of taxes | 0 | 1 | 0 | 0
Common stock dividends |  |  | (6,010) | (5,973)
Common stock issuance expenses |  |  | 2 | (1)
Ending Balance | 272,798 | 261,903 | 272,798 | 261,903
Other subsidiaries | Reportable Legal Entities |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |
Beginning Balance |  |  | 101 | 101
Net income for common stock | 0 | 0 | 0 | 0
Other comprehensive income (loss), net of taxes | 0 | 0 | 0 | 0
Common stock dividends |  |  | 0 | 0
Common stock issuance expenses |  |  | 0 | 0
Ending Balance | 101 | 101 | 101 | 101
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |
Beginning Balance |  |  | 1,845,283 | 1,799,787
Net income for common stock | 31,169 | 25,644 | 58,644 | 47,109
Other comprehensive income (loss), net of taxes | 26 | 40 | 57 | 499
Common stock dividends |  |  | (51,652) | (43,884)
Common stock issuance expenses |  |  | (8) | (5)
Ending Balance | $ 1,852,324 | $ 1,803,506 | $ 1,852,324 | $ 1,803,506

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- Definition Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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