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Financial risk management (Tables)
 12 Months Ended
Dec. 31, 2017
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
2017

Dec 31
2016

Fixed interest rate debt:
 
 
Unsecured notes
$
1,188,163

$
1,186,424

 
$
1,188,163

$
1,186,424

Variable interest rate debt:
 
 
Egypt limited recourse debt facilities
$
241,190

$
288,515

Other limited recourse debt facilities
72,918

81,267

 
$
314,108

$
369,782
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, 2017
Carrying
amount

Contractual
cash flows

 
1 year or less

1-3 years

3-5 years

More than
5 years

Trade and other payables1
$
519,352

$
519,352

 
$
519,352

$
—

$
—

$
—

Finance lease obligations
204,242

397,876

 
31,447

64,039

65,618

236,772

Long-term debt2
1,502,271

2,178,011

 
121,689

586,091

471,831

998,400

Cash flow hedges
91,014

105,120

 
7,114

17,057

28,864

52,085

 
$
2,316,879

$
3,200,359

 
$
679,602

$
667,187

$
566,313

$
1,287,257

1 
Excludes tax and accrued interest.
2 
Contractual cash flows include contractual interest payments related to debt obligations. Interest rates on variable rate debt are based on prevailing rates as at December 31, 2017.