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Summary of significant accounting policies (Details 4) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Other amortization | $ 6,795 | $ 4,667 | [1] | $ 7,958 | [1]
Increase (decrease) in deferred income taxes | 103,916 | 80,399 | [1] | 90,848 | [1]
Share-based compensation expense | 9,287 | 7,780 | [1] | 6,698 | [1]
Increase (decrease) in accounts, interest and dividends payable | (67,189) | 12,406 | [1] | 5,497 | [1]
Change in prepaid and accrued income taxes and utility revenue taxes | (39,091) | (19,406) | [1] | 21,079 | [1]
Change in other assets and liabilities | (94,966) | (11,696) | [1] | (102,275) | [1]
Net cash provided by operating activities | 325,420 | 361,568 | [1] | 278,934 | [1]
Capital expenditures | (364,826) | (389,438) | [1] | (370,715) | [1]
Cash flows from investing activities-Other | 1,125 | 1,177 | [1] | 1,778 | [1]
Net cash used in investing activities | (592,449) | (598,182) | [1] | (471,439) | [1]
Federal current taxes | (10,970) | (1,520) |  | (15,411) |
Federal deferred taxes | 91,159 | 73,680 |  | 82,138 |
Additions to electric utility property, plant and equipment - unpaid invoices and other (investing)/______________________________ (in millions) | 43,000 | (12,000) |  | (8,000) |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Other amortization | 6,410 | 5,077 | [1] | 6,998 | [1]
Increase (decrease) in accounts payable | (65,527) | 14,731 | [1] | 6,322 | [1]
Increase (decrease) in deferred income taxes | 82,947 | 64,507 | [1] | 86,878 | [1]
Change in prepaid and accrued income taxes and utility revenue taxes | (4,036) | (2,028) | [1] | 25,239 | [1]
Change in other assets and liabilities | (62,442) | (32,636) | [1] | (74,262) | [1]
Net cash provided by operating activities | 306,995 | 326,865 | [1] | 221,623 | [1]
Capital expenditures | (336,679) | (378,044) | [1] | (355,326) | [1]
Cash flows from investing activities-Other | 1,164 | 907 | [1] | 843 | [1]
Net cash used in investing activities | (293,709) | (344,977) | [1] | (308,501) | [1]
Federal current taxes | 1,108 | 1,313 |  | (26,965) |
Federal deferred taxes | 68,775 | 58,024 |  | 79,437 |
Additions to electric utility property, plant and equipment - unpaid invoices and other (investing)/______________________________ (in millions) | 40,000 | (12,000) |  | (8,000) |
As previously filed |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Other amortization | 8,476 |  |  |  |
Increase (decrease) in deferred income taxes | 59,184 |  |  |  |
Share-based compensation expense | 0 | 0 |  | 0 |
Increase (decrease) in accounts, interest and dividends payable | (92,294) | (23,153) |  | (39,738) |
Change in prepaid and accrued income taxes and utility revenue taxes | 12,845 |  |  |  |
Change in other assets and liabilities | (93,400) | (2,779) |  | (94,734) |
Net cash provided by operating activities | 301,479 | 327,146 |  | 234,542 |
Capital expenditures | (339,721) | (353,879) |  | (325,480) |
Cash flows from investing activities-Other | (39) | 40 |  | 935 |
Net cash used in investing activities | (568,508) | (563,760) |  | (427,047) |
Federal current taxes | 33,762 |  |  |  |
Federal deferred taxes | 46,427 |  |  |  |
Additions to electric utility property, plant and equipment - unpaid invoices and other (investing)/______________________________ (in millions) | 68,000 | 24,000 |  | 37,000 |
As previously filed | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Other amortization | 8,091 |  |  |  |
Increase (decrease) in accounts payable | (90,632) | (20,828) |  | (38,913) |
Change in other assets and liabilities | (62,959) | (31,499) |  | (73,419) |
Net cash provided by operating activities | 283,054 | 292,443 |  | 177,231 |
Capital expenditures | (311,574) | (342,485) |  | (310,091) |
Cash flows from investing activities-Other | 0 | (230) |  | 0 |
Net cash used in investing activities | (269,768) | (310,555) |  | (264,109) |
Additions to electric utility property, plant and equipment - unpaid invoices and other (investing)/______________________________ (in millions) | 65,000 | 24,000 |  | 37,000 |
Difference |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Other amortization | (1,681) |  |  |  |
Increase (decrease) in deferred income taxes | 44,732 |  |  |  |
Share-based compensation expense | 9,287 | 7,780 |  | 6,698 |
Increase (decrease) in accounts, interest and dividends payable | 25,105 | 35,559 |  | 45,235 |
Change in prepaid and accrued income taxes and utility revenue taxes | (51,936) |  |  |  |
Change in other assets and liabilities | (1,566) | (8,917) |  | (7,541) |
Net cash provided by operating activities | 23,941 | 34,422 |  | 44,392 |
Capital expenditures | (25,105) | (35,559) |  | (45,235) |
Cash flows from investing activities-Other | 1,164 | 1,137 |  | 843 |
Net cash used in investing activities | (23,941) | (34,422) |  | (44,392) |
Federal current taxes | (44,732) |  |  |  |
Federal deferred taxes | 44,732 |  |  |  |
Additions to electric utility property, plant and equipment - unpaid invoices and other (investing)/______________________________ (in millions) | (25,000) | (36,000) |  | (45,000) |
Difference | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Other amortization | (1,681) |  |  |  |
Increase (decrease) in accounts payable | 25,105 | 35,559 |  | 45,235 |
Change in other assets and liabilities | 517 | (1,137) |  | (843) |
Net cash provided by operating activities | 23,941 | 34,422 |  | 44,392 |
Capital expenditures | (25,105) | (35,559) |  | (45,235) |
Cash flows from investing activities-Other | 1,164 | 1,137 |  | 843 |
Net cash used in investing activities | (23,941) | (34,422) |  | (44,392) |
Additions to electric utility property, plant and equipment - unpaid invoices and other (investing)/______________________________ (in millions) | $ (25,000) | $ (36,000) |  | $ (45,000) |
[1] | As restated - See Note 1, “Summary of significant accounting policies - Revision and restatements of previously issued financial statements.”

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