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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Increase (decrease) in stockholders' equity |  |  |  |
Beginning Balance |  |  | $ 2,066,753 | $ 1,927,640
Net income for common stock | $ 38,661 | $ 44,128 | 72,854 | 76,480
Other comprehensive income (loss), net of taxes | 2,370 | 2,108 | 3,355 | 10,908
Common stock dividends |  |  | (67,426) | (66,848)
Ending Balance | 2,075,029 | 1,966,182 | 2,075,029 | 1,966,182
Hawaiian Electric Company |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |
Beginning Balance |  |  | 1,799,787 | 1,728,325
Net income for common stock | 25,644 | 35,857 | 47,109 | 61,224
Other comprehensive income (loss), net of taxes | 40 | (755) | 499 | 261
Common stock dividends |  |  | (43,884) | (46,800)
Common stock issuance expenses |  |  | (5) | (4)
Ending Balance | 1,803,506 | 1,743,006 | 1,803,506 | 1,743,006
HELCO |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |
Beginning Balance |  |  | 291,291 | 292,702
Net income for common stock | 3,632 | 5,220 | 8,216 | 9,182
Other comprehensive income (loss), net of taxes | 1 | (1) | 1 | (1)
Common stock dividends |  |  | (7,748) | (6,604)
Common stock issuance expenses |  |  | 0 | (4)
Ending Balance | 291,760 | 295,275 | 291,760 | 295,275
Maui Electric |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |
Beginning Balance |  |  | 259,554 | 263,725
Net income for common stock | 4,304 | 5,663 | 8,323 | 9,630
Other comprehensive income (loss), net of taxes | 1 | (2) | 0 | (2)
Common stock dividends |  |  | (5,973) | (6,530)
Common stock issuance expenses |  |  | (1) | 0
Ending Balance | 261,903 | 266,823 | 261,903 | 266,823
Other subsidiaries |  |  |  |
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
Consolidating adjustments |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |
Beginning Balance |  |  | (550,946) | (556,528)
Net income for common stock | (7,936) | (10,883) | (16,539) | (18,812)
Other comprehensive income (loss), net of taxes | (2) | 3 | (1) | 3
Common stock dividends |  |  | 13,721 | 13,134
Common stock issuance expenses |  |  | 1 | 4
Ending Balance | (553,764) | (562,199) | (553,764) | (562,199)
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Increase (decrease) in stockholders' equity |  |  |  |
Beginning Balance |  |  | 1,799,787 | 1,728,325
Net income for common stock | 25,644 | 35,857 | 47,109 | 61,224
Other comprehensive income (loss), net of taxes | 40 | (755) | 499 | 261
Common stock dividends |  |  | (43,884) | (46,800)
Common stock issuance expenses |  |  | (5) | (4)
Ending Balance | $ 1,803,506 | $ 1,743,006 | $ 1,803,506 | $ 1,743,006

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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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