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Basis of presentation - Restatement and revision of previously filed financial statements (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2015 | Jun. 30, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Other amortization | [1] | $ 4,792 | $ 4,014
Increase (decrease) in deferred income taxes | [1] | (4,463) | 44,494
Share-based compensation expense | [1] | 3,769 | 5,206
Increase (decrease) in accounts, interest and dividends payable | [1] | 8,504 | (40,230)
Change in other assets and liabilities | [1] | (24,455) | (38,540)
Net cash provided by operating activities | [1] | 168,372 | 70,307
Capital expenditures | [1] | (206,816) | (173,866)
Other | [1] | 3,819 | 485
Net cash used in investing activities | [1] | (291,775) | (296,214)
Additions to electric utility property, plant and equipment - unpaid invoices and other (investing)/______________________________ (in millions) |  | (12,000) | 3,000
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Other amortization | [1] | 3,220 | 3,597
Increase (decrease) in deferred income taxes | [1] | 33,320 | 45,386
Change in other assets and liabilities | [1] | (14,085) | (26,759)
Net cash provided by operating activities | [1] | 127,676 | 49,244
Capital expenditures | [1] | (199,143) | (170,347)
Other |  | 511 | 501
Net cash used in investing activities | [1] | (179,543) | (156,637)
Decrease in accounts payable | [1] | (4,371) | (38,693)
Additions to electric utility property, plant and equipment - unpaid invoices and other (investing)/______________________________ (in millions) |  | (12,000) | 3,000
Scenario, Previously Reported |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Other amortization |  | 4,320 |
Increase (decrease) in deferred income taxes |  | 22,980 | 28,570
Share-based compensation expense |  | 0 | 0
Increase (decrease) in accounts, interest and dividends payable |  | (56,076) | (64,843)
Change in other assets and liabilities |  | (47,146) | (16,909)
Net cash provided by operating activities |  | 104,303 | 46,195
Capital expenditures |  | (142,236) | (149,253)
Other |  | 3,308 | (16)
Net cash used in investing activities |  | (227,706) | (272,102)
Additions to electric utility property, plant and equipment - unpaid invoices and other (investing)/______________________________ (in millions) |  | 53,000 | 28,000
Scenario, Previously Reported | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Other amortization |  | 2,748 |
Change in other assets and liabilities |  | (13,102) | (26,258)
Net cash provided by operating activities |  | 63,607 | 25,132
Capital expenditures |  | (134,563) | (145,734)
Other |  | 0 | 0
Net cash used in investing activities |  | (115,474) | (132,525)
Decrease in accounts payable |  | (68,951) | (63,306)
Additions to electric utility property, plant and equipment - unpaid invoices and other (investing)/______________________________ (in millions) |  | 53,000 | 28,000
Difference |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Other amortization |  | 472 |
Increase (decrease) in deferred income taxes |  | (27,443) | 15,924
Share-based compensation expense |  | 3,769 | 5,206
Increase (decrease) in accounts, interest and dividends payable |  | 64,580 | 24,613
Change in other assets and liabilities |  | 22,691 | (21,631)
Net cash provided by operating activities |  | 64,069 | 24,112
Capital expenditures |  | (64,580) | (24,613)
Other |  | 511 | 501
Net cash used in investing activities |  | (64,069) | (24,112)
Additions to electric utility property, plant and equipment - unpaid invoices and other (investing)/______________________________ (in millions) |  | (65,000) | (25,000)
Difference | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Other amortization |  | 472 |
Change in other assets and liabilities |  | (983) | (501)
Net cash provided by operating activities |  | 64,069 | 24,112
Capital expenditures |  | (64,580) | (24,613)
Other |  | 511 | 501
Net cash used in investing activities |  | (64,069) | (24,112)
Decrease in accounts payable |  | 64,580 | 24,613
Additions to electric utility property, plant and equipment - unpaid invoices and other (investing)/______________________________ (in millions) |  | $ (65,000) | $ (25,000)
[1] | As restated - See Note 1, “Basis of presentation - Restatement of previously issued financial statements.”

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