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Long-term debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Long-term Debt, Unclassified [Abstract] |
Schedule of long-term debt |
December 31 | 2017 |  |  | 2016 |
(dollars in thousands) |  |  |  |  |
Long-term debt of Utilities, net of unamortized debt issuance costs 1 | $ | 1,368,479 |  |  | $ | 1,319,260 |
Hamakua Energy 4.02% notes, due 2030 | 67,325 |  |  | — |
HEI 2.99% term loan, due 2022 | 150,000 |  |  | — |
HEI 5.67% senior notes, due 2021 | 50,000 |  |  | 50,000 |
HEI 3.99% senior notes, due 2023 | 50,000 |  |  | 50,000 |
HEI term loans LIBOR + 0.75%, paid 2017 | — |  |  | 200,000 |
Less unamortized debt issuance costs | (2,007 | ) |  | (241 | )
| $ | 1,683,797 |  |  | $ | 1,619,019 |
1 | See components of “Total long-term debt” and unamortized debt issuance costs in Hawaiian Electric and subsidiaries’ Consolidated Statements of Capitalization.
On June 29, 2017, the DBF for the benefit of the Utilities, issued, at par:
| Refunding Series 2017A Special Purpose Revenue Bonds | Refunding Series 2017B Special Purpose Revenue Bonds
Aggregate principal amount | $125 million | $140 million
Fixed coupon interest rate | 3.10% | 4.00%
Maturity date | May 1, 2026 | March 1, 2037
DBF loaned the proceeds to: |  |
Hawaiian Electric | $62 million | $100 million
Hawaii Electric Light | $8 million | $20 million
Maui Electric | $55 million | $20 million
Proceeds from the sale were applied to redeem at par bonds previously issued by the DBF for the benefit of the Utilities:
| Refunding Series 2007B Special Purpose Revenue Bonds | Series 2007A Special Purpose Revenue Bonds
Aggregate principal amount | $125 million | $140 million
Fixed coupon interest rate | 4.60% | 4.65%
Maturity date | May 1, 2026 | March 1, 2037

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 + Details
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