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Financial risk management (Tables)
 12 Months Ended
Dec. 31, 2018
Financial Instruments [Abstract]  
Schedule of interest rate risk exposure
The Company’s interest rate risk exposure is mainly related to long-term debt obligations.
As at
Dec 31
2018

Dec 31
2017

Fixed interest rate debt:
 
 
Unsecured notes
$
1,189,976

$
1,188,163

Other limited recourse debt facilities
161,601

—

 
$
1,351,577

$
1,188,163

Variable interest rate debt:
 
 
Egypt limited recourse debt facilities
$
101,226

$
241,190

Other limited recourse debt facilities
5,483

72,918

 
$
106,709

$
314,108
Expected cash flows of financial liabilities by maturity date
The expected cash flows of financial liabilities from the date of the balance sheet to the contractual maturity date are as follows:
As at December 31, 2018
Carrying
amount

Contractual
cash flows

 
1 year or less

1-3 years

3-5 years

More than
5 years

Trade and other payables1
$
516,153

$
516,153

 
$
516,153

$
—

$
—

$
—

Finance lease obligations
198,374

370,274

 
32,222

65,628

66,201

206,223

Long-term debt2
1,458,286

2,129,284

 
453,430

187,564

365,200

1,123,090

Cash flow hedges3
105,721

123,615

 
7,006

35,551

40,130

40,928

 
$
2,278,534

$
3,139,326

 
$
1,008,811

$
288,743

$
471,531

$
1,370,241

1 
Excludes tax and accrued interest.
2 
Contractual cash flows include contractual interest payments related to debt obligations and finance lease obligations. Interest rates on variable rate debt are based on prevailing rates as at December 31, 2018.
3 
Cash flow hedges includes the impact of discounting and credit valuation adjustments