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Long-term debt (Tables)
 12 Months Ended
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