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Electric utility segment - Condensed consolidating statement of changes in common stock equity (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Increase (decrease) in stockholders' equity |  |
Beginning Balance | $ 2,097,386 | $ 2,066,753
Net income for common stock | 40,247 | 34,193
Other comprehensive income (loss), net of taxes | (12,773) | 985
Common stock dividends | (33,741) | (33,713)
Ending Balance | 2,091,777 | 2,065,588
Hawaiian Electric Company |  |
Increase (decrease) in stockholders' equity |  |
Beginning Balance | 1,845,283 | 1,799,787
Net income for common stock | 27,475 | 21,465
Other comprehensive income (loss), net of taxes | 31 | 459
Common stock dividends | (25,826) | (21,942)
Common stock issuance expenses | (8) |
Ending Balance | 1,846,955 | 1,799,769
HELCO |  |
Increase (decrease) in stockholders' equity |  |
Beginning Balance | 286,647 | 291,291
Net income for common stock | 6,101 | 4,584
Other comprehensive income (loss), net of taxes | 0 | 0
Common stock dividends | (3,821) | (3,874)
Common stock issuance expenses | 0 |
Ending Balance | 288,927 | 292,001
Maui Electric |  |
Increase (decrease) in stockholders' equity |  |
Beginning Balance | 270,265 | 259,554
Net income for common stock | 3,224 | 4,019
Other comprehensive income (loss), net of taxes | 0 | (1)
Common stock dividends | (3,006) | (2,986)
Common stock issuance expenses | 0 |
Ending Balance | 270,483 | 260,586
Other subsidiaries |  |
Increase (decrease) in stockholders' equity |  |
Beginning Balance | 101 | 101
Net income for common stock | 0 | 0
Other comprehensive income (loss), net of taxes | 0 | 0
Common stock dividends | 0 | 0
Common stock issuance expenses | 0 |
Ending Balance | 101 | 101
Consolidating adjustments |  |
Increase (decrease) in stockholders' equity |  |
Beginning Balance | (557,013) | (550,946)
Net income for common stock | (9,325) | (8,603)
Other comprehensive income (loss), net of taxes | 0 | 1
Common stock dividends | 6,827 | 6,860
Common stock issuance expenses | 0 |
Ending Balance | (559,511) | (552,688)
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Increase (decrease) in stockholders' equity |  |
Beginning Balance | 1,845,283 | 1,799,787
Net income for common stock | 27,475 | 21,465
Other comprehensive income (loss), net of taxes | 31 | 459
Common stock dividends | (25,826) | (21,942)
Common stock issuance expenses | (8) |
Ending Balance | $ 1,846,955 | $ 1,799,769

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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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