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Long-term debt (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
May. 05, 2014 | May. 02, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | [1]
Long-term debt |  |  |  |  |  |
Long-term debt |  |  | $ 1,506,546 | $ 1,492,945 |  |
Aggregate principal payments |  |  |  |  |  |
2015 |  |  | 0 |  |  |
2016 |  |  | 200,000 |  |  |
2017 |  |  | 0 |  |  |
2018 |  |  | 50,000 |  |  |
2019 |  |  | 0 |  |  |
Proceeds from issuance of long-term debt |  |  | 125,000 | 286,000 | [1] | $ 457,000
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |
Aggregate principal payments |  |  |  |  |  |
2015 |  |  | 0 |  |  |
2016 |  |  | 0 |  |  |
2017 |  |  | 0 |  |  |
2018 |  |  | 50,000 |  |  |
2019 |  |  | 0 |  |  |
Proceeds from issuance of long-term debt |  |  | 0 | 236,000 | [1] | $ 457,000
Special purpose revenue bonds issued on behalf of electric utility subsidiaries |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Long-term debt |  |  | 1,206,546 | 1,217,945 |  |
HEI term loan LIBOR plus .90% due 2016 |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Long-term debt |  |  | $ 125,000 | 0 |  |
HEI term loan LIBOR plus .90% due 2016 | LIBOR |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Line of credit facility basis point spread (as a percent) |  |  | 0.90% |  |  |
HEI medium-term note 6.51%, due 2014 |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Long-term debt |  |  | $ 0 | $ 100,000 |  |
Debt instrument, stated interest rate (as a percent) |  |  | 6.51% | 6.51% |  |
HEI medium-term note 6.51%, due 2014 | Medium-term note |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Debt instrument, stated interest rate (as a percent) | 6.51% |  |  |  |  |
Aggregate principal payments |  |  |  |  |  |
Refinancing of unsecured debt payable | $ 100,000 |  |  |  |  |
HEI senior note 4.41%, due 2016 |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Long-term debt |  |  | $ 75,000 | $ 75,000 |  |
Debt instrument, stated interest rate (as a percent) |  |  | 4.41% | 4.41% |  |
HEI senior note 5.67%, due 2021 |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Long-term debt |  |  | $ 50,000 | $ 50,000 |  |
Debt instrument, stated interest rate (as a percent) |  |  | 5.67% | 5.67% |  |
HEI senior note 3.99%, due 2023 |  |  |  |  |  |
Long-term debt |  |  |  |  |  |
Long-term debt |  |  | $ 50,000 | $ 50,000 |  |
Debt instrument, stated interest rate (as a percent) |  |  | 3.99% | 3.99% |  |
Loans payable | Eurodollar term loan |  |  |  |  |  |
Aggregate principal payments |  |  |  |  |  |
Proceeds from issuance of long-term debt |  | $ 125,000 |  |  |  |
Term Of Loan |  | 2 years |  |  |  |
Loans payable | Eurodollar term loan | Minimum |  |  |  |  |  |
Aggregate principal payments |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 1.12% |  |  |  |
Loans payable | Eurodollar term loan | Maximum |  |  |  |  |  |
Aggregate principal payments |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 1.14% |  |  |  |
[1] | As restated - See Note 1, “Summary of significant accounting policies - Revision and restatements of previously issued financial statements.”

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