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Long-term debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Long Term Debt | Long-term debt consists of the following:
Borrowing type |  | Weighted average coupon |  | Maturity |  | Par value |  | 2017 |  | 2016
Senior Unsecured Revolving Credit Facilities (a) |  | — |  |  | 2018-2022 |  | N/A |  |  | $ | 65,017 |  |  | $ | 242,947 |
Senior Unsecured Bank Credit Facilities (b) |  | — |  |  | 2018-2019 |  | N/A |  |  | 169,343 |  |  | 2,140,122 |
Commercial Paper (c) |  |  |  | 2019 |  | N/A |  |  | 6,994 |  |  | — |
Canadian Dollar Borrowings |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes (d) |  | 4.61 | % |  | 2018-2027 |  | $ | 785,669 |  |  | 781,833 |  |  | 487,389 |
Senior Secured Project Notes |  | 10.27 | % |  | 2020-2027 |  | $ | 33,568 |  |  | 33,507 |  |  | 35,600 |
U.S. Dollar Borrowings |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes (e) |  | 4.09 | % |  | 2020-2047 |  | US$ | 1,225,000 |  |  | 1,527,726 |  |  | 700,600 |
Senior Unsecured Utility Notes (f) |  | 5.98 | % |  | 2020-2035 |  | US$ | 227,000 |  |  | 309,309 |  |  | 174,206 |
Senior Secured Utility Bonds (g) |  | 4.95 | % |  | 2018-2044 |  | US$ | 752,500 |  |  | 969,567 |  |  | 132,551 |
|  |  |  |  |  |  |  | $ | 3,863,296 |  |  | $ | 3,913,415 |
Less: current portion |  |  |  |  |  |  |  | (15,511 | ) |  | (10,075 | )
|  |  |  |  |  |  |  | $ | 3,847,785 |  |  | $ | 3,903,340 |
Principal Payments | Principal payments due in the next five years and thereafter are as follows:
2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | Thereafter |  | Total
$ | 279,724 |  |  | $ | 179,107 |  |  | $ | 391,025 |  |  | $ | 152,626 |  |  | $ | 492,343 |  |  | $ | 2,331,327 |  |  | $ | 3,826,152 |

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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=84159872&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=75038535&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=84159872&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=84159872&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=84159872&loc=d3e21521-112644 + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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