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Basis of presentation (Tables) | 9 Months Ended
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Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Change in Accounting Estimate | The table below illustrates the effects of the revisions on the previously filed financial statements:
|  | As previously |  |  | As |  |  |
(in thousands) |  | filed |  |  | revised |  |  | Difference |
Nine months ended September 30, 2014 |  |  |  |  |  |
Consolidated Statements of Cash Flows |  |  |  |  |  |
HEI consolidated |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |
Other amortization |  | $ | 5,454 |  |  | $ | 5,081 |  |  | $ | (373 | )
Increase in deferred income taxes (1) |  | 49,270 |  |  | 50,296 |  |  | 1,026 |
Share-based compensation expense |  | — |  |  | 7,200 |  |  | 7,200 |
Decrease in accounts, interest and dividends payable |  | (75,812 | ) |  | (51,199 | ) |  | 24,613 |
Change in other assets and liabilities (1) |  | (47,760 | ) |  | (56,326 | ) |  | (8,566 | )
Net cash provided by operating activities |  | 173,410 |  |  | 197,310 |  |  | 23,900 |
Cash flows from investing activities |  |  |  |  |  |
Capital expenditures |  | (236,003 | ) |  | (260,616 | ) |  | (24,613 | )
Cash flows from investing activities-Other |  | (39 | ) |  | 674 |  |  | 713 |
Net cash used in investing activities |  | (376,992 | ) |  | (400,892 | ) |  | (23,900 | )
Hawaiian Electric consolidated |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |
Other amortization |  | 4,662 |  |  | 4,289 |  |  | (373 | )
Decrease in accounts payable |  | (77,893 | ) |  | (53,280 | ) |  | 24,613 |
Change in other assets and liabilities |  | (41,629 | ) |  | (41,969 | ) |  | (340 | )
Net cash provided by operating activities |  | 146,267 |  |  | 170,167 |  |  | 23,900 |
Cash flows from investing activities |  |  |  |  |  |
Capital expenditures |  | (229,105 | ) |  | (253,718 | ) |  | (24,613 | )
Cash flows from investing activities-Other |  | — |  |  | 713 |  |  | 713 |
Net cash used in investing activities |  | (207,365 | ) |  | (231,265 | ) |  | (23,900 | )
Note 10 |  |  |  |  |  |
HEI consolidated and Hawaiian Electric consolidated |  |  |  |  |  |
Additions to electric utility property, plant and equipment - unpaid invoices and accruals (investing) (in millions) |  | 40 |  |  | 15 |  |  | (25 | )
(1) As previously filed and adjusted by ASU No. 2014-01 (see Note 11).

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- Definition Tabular disclosure of the change in an accounting estimate, including a change that occurs in an interim period. If a change in accounting estimate affects several future periods (for example, a change in the service life of a depreciable asset) disclose the effect on income from continuing operations, net income (or other appropriate captions of changes in the applicable net assets or performance indicator), and any related per-share amounts of the current period. Disclosure of the effects of a change in an accounting estimate that occurs in the ordinary course of business (such as uncollectible accounts or inventory obsolescence) is not required, unless the effect is material. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e777-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6368906&loc=d3e21843-107793 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22595-107794 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.10-01.(a)(5)) -URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 01 -Paragraph a -Subparagraph 5 -Article 10 + Details
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