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Long-term debt (Tables) | 6 Months Ended
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Jun. 30, 2019
Debt Disclosure [Abstract] |
Long Term Debt | Long-term debt consists of the following:
Borrowing type |  | Weighted average coupon |  | Maturity |  | Par value |  | June 30, 2019 |  | December 31, 2018
Senior unsecured revolving credit facilities (a) |  | — |  |  | 2019-2023 |  | N/A |  |  | $ | 145,290 |  |  | $ | 97,000 |
Senior unsecured bank credit facilities (b) |  | — |  |  | 2019-2020 |  | N/A |  |  | 135,000 |  |  | 321,807 |
Commercial paper (c) |  | — |  |  | 2023 |  | N/A |  |  | 1,250 |  |  | 6,000 |
U.S. dollar borrowings |  |  |  |  |  |  |  |  |  |
Senior unsecured notes |  | 4.09 | % |  | 2020-2047 |  | $ | 1,225,000 |  |  | 1,219,124 |  |  | 1,218,680 |
Senior unsecured utility notes |  | 5.99 | % |  | 2020-2035 |  | $ | 222,000 |  |  | 239,476 |  |  | 240,161 |
Senior secured utility bonds |  | 4.75 | % |  | 2020-2044 |  | $ | 662,500 |  |  | 674,517 |  |  | 676,697 |
Subordinated unsecured notes (d) |  | 6.5 | % |  | 2078-2079 |  | 637,500 |  |  | 621,458 |  |  | 278,771 |
Canadian dollar borrowings |  |  |  |  |  |  |  |  |  |
Senior unsecured notes (e) |  | 4.48 | % |  | 2020-2029 |  | C$ | 950,669 |  |  | 722,901 |  |  | 474,764 |
Senior secured project notes |  | 10.24 | % |  | 2020-2027 |  | C$ | 29,956 |  |  | 22,890 |  |  | 22,915 |
|  |  |  |  |  |  |  | $ | 3,781,906 |  |  | $ | 3,336,795 |
Less: current portion |  |  |  |  |  |  |  | (8,429 | ) |  | (13,048 | )
|  |  |  |  |  |  |  | $ | 3,773,477 |  |  | $ | 3,323,747 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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