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Capital disclosures (Tables)
 12 Months Ended
Dec. 31, 2017
Corporate Information And Statement Of IFRS Compliance [Abstract]  
Schedule of liquidity and capitalization
As at
Dec 31
2017

Dec 31
2016

Liquidity:
 
 
Cash and cash equivalents
$
375,479

$
223,890

Undrawn credit facilities
300,000

300,000

Total liquidity
$
675,479

$
523,890

Capitalization:
 
 
Unsecured notes
$
1,188,163

$
1,186,424

Limited recourse debt facilities, including current portion
314,108

369,782

Total debt
1,502,271

1,556,206

Non-controlling interests
244,347

208,515

Shareholders’ equity
1,500,764

1,596,835

Total capitalization
$
3,247,382

$
3,361,556

Total debt to capitalization1
46
%
46
%
Net debt to capitalization2
39
%
42
%
1 
Total debt (including 100% of Egypt limited recourse debt facilities) divided by total capitalization.
2 
Total debt (including 100% of Egypt limited recourse debt facilities) less cash and cash equivalents divided by total capitalization less cash and cash equivalents.