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Asset retirement obligations (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of Asset Retirement Obligations [abstract]  
Summary of Asset Retirement Obligations
 
Turkey

Canada

Greece

Romania

Brazil

Total

 
 
 
 
 
 
 
At January 1, 2019
$
36,479

$
12,215

$
40,069

$
1,364

$
4,016

$
94,143

Accretion during the year
981

316

1,090

39

106

2,532

Revisions to estimate
2,330

107

3,704

130

—

6,271

Settlements
(594
)
—

(2,213
)
—

—

(2,807
)
Reclassified to liabilities associated with assets held for sale
—

—

—

—

(4,122
)
(4,122
)
At December 31, 2019
39,196

12,638

42,650

1,533

—

96,017

Less: Current portion
—

—

(1,782
)
—

—

(1,782
)
Long term portion
$
39,196

$
12,638

$
40,868

$
1,533

$
—

$
94,235

 
 
 
 
 
 
 
Estimated undiscounted amount
$
48,064

$
14,998

$
56,467

$
2,287

$
4,416

$
126,232


 
Turkey

Canada

Greece

Romania

Brazil

Total

 
 
 
 
 
 
 
At January 1, 2018
$
37,321

$
9,453

$
47,461

$
1,405

$
4,044

$
99,684

Accretion during the year
896

—

1,035

36

71

2,038

Revisions to estimate
(1,117
)
2,762

(3,512
)
(77
)
(99
)
(2,043
)
Settlements
(621
)
—

(4,915
)
—

—

(5,536
)
At December 31, 2018
36,479

12,215

40,069

1,364

4,016

94,143

Less: Current portion
—

—

(824
)
—

—

(824
)
Long term portion
$
36,479

$
12,215

$
39,245

$
1,364

$
4,016

$
93,319

 
 
 
 
 
 
 
Estimated undiscounted amount
$
48,454

$
14,989

$
65,274

$
2,335

$
4,121

$
135,173
Summary of Present Value of Estimated Future Net Cash Outflows
 
Turkey
Canada
Greece
Romania
Brazil
 
%
%
%
%
%
At December 31, 2019
 
 
 
 
 
Inflation rate
1.8
1.8
1.7 to 1.9
1.9
1.6
Discount rate
1.9
1.9
1.7 to 2.3
2.3
1.6
 
 
 
 
 
 
At December 31, 2018
 
 
 
 
 
Inflation rate
2.2 to 2.3
2.2 to 2.3
2.2 to 2.3
2.2 to 2.3
2.2 to 2.3
Discount rate
2.7
2.7
2.5 to 2.9
2.9
2.6