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Employee benefit plans (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of defined benefit plans [abstract]  
Summary of Defined Benefit Plans
 
December 31, 2019

 
December 31, 2018

Employee benefit plan expense:
 
 
 
Employee Benefit Plan
$
2,778

 
$
3,463

Supplemental Pension Plan
(61
)
 
92

 
$
2,717

 
$
3,555

 
 
 
 
Actuarial losses recognized in the statement of other comprehensive income (loss) in the period, before tax
$
(6,361
)
 
$
(1,197
)
 
 
 
 
Cumulative actuarial losses recognized in the statement of other comprehensive income (loss), before tax
$
(26,199
)
 
$
(19,838
)
Summary of Amounts Recognised in the Statement of Financial Position for All Pension Plans
The amounts recognized in the consolidated statement of financial position for all pension plans are determined as follows:
 
December 31, 2019
 
December 31, 2018
 
Employee benefit plans

SERP

Total

 
Employee benefit plans

SERP

Total

 
 
 
 
 
 
 
 
Present value of obligations
$
(20,182
)
$
(18,366
)
$
(38,548
)
 
$
(16,239
)
$
(37,075
)
$
(53,314
)
Fair value of plan assets
1,958

24,610

26,568

 
1,864

46,195

48,059

Asset (liability) on statement of financial position
$
(18,224
)
$
6,244

$
(11,980
)
 
$
(14,375
)
$
9,120

$
(5,255
)
Summary of Movement in the Defined Benefit Obligation Over the Year
The movement in the present value of the employee benefit obligations over the years is as follows:
 
2019
 
2018
 
Employee benefit plans

SERP

Total

 
Employee benefit plans

SERP

Total

 
 
 
 
 
 
 
 
Balance at January 1,
$
(16,239
)
$
(37,075
)
$
(53,314
)
 
$
(16,028
)
$
(43,956
)
$
(59,984
)
Current service cost
(2,181
)
(172
)
(2,353
)
 
(2,935
)
(269
)
(3,204
)
Past service cost
—

(97
)
(97
)
 
—

(146
)
(146
)
Interest cost
(669
)
(1,447
)
(2,116
)
 
(601
)
(1,403
)
(2,004
)
Actuarial gain (loss)
(3,097
)
(4,781
)
(7,878
)
 
(1,209
)
2,512

1,303

Assets distributed on settlement
—

24,430

24,430

 
—

—

—

Benefit payments
1,576

2,189

3,765

 
1,066

2,829

3,895

Exchange gain (loss)
428

(1,413
)
(985
)
 
3,468

3,358

6,826

Balance at December 31,
$
(20,182
)
$
(18,366
)
$
(38,548
)
 
$
(16,239
)
$
(37,075
)
$
(53,314
)
Summary of Movement in the Fair Value of Plan Assets of the Year
The movement in the fair value of plan assets over the years is as follows:
 
2019
 
2018
 
Employee benefit plans

SERP

Total

 
Employee benefit plans

SERP

Total

 
 
 
 
 
 
 
 
At January 1,
$
1,864

$
46,195

$
48,059

 
$
2,429

$
53,875

$
56,304

Interest income on plan assets
72

1,809

1,881

 
73

1,726

1,799

Actuarial gain (loss)
82

1,435

1,517

 
(64
)
(2,436
)
(2,500
)
Assets distributed on settlement
—

(24,430
)
(24,430
)
 
—

—

—

Benefit payments
(152
)
(2,189
)
(2,341
)
 
(399
)
(2,828
)
(3,227
)
Exchange gain (loss)
92

1,790

1,882

 
(175
)
(4,142
)
(4,317
)
At December 31,
$
1,958

$
24,610

$
26,568

 
$
1,864

$
46,195

$
48,059
Summary of Amounts Recognised in the Statements of Operations
The amounts recognized in the consolidated statements of operations are as follows:
 
2019
 
2018
 
Employee benefit plans

SERP

Total

 
Employee benefit plans

SERP

Total

 
 
 
 
 
 
 
 
Current service cost
$
2,181

$
172

$
2,353

 
$
2,935

$
269

$
3,204

Interest cost
669

1,447

2,116

 
601

1,404

2,005

Past service cost
—

97

97

 
—

146

146

Loss on settlement
—

32

32

 
—

—

—

Expected return on plan assets
(72
)
(1,809
)
(1,881
)
 
(73
)
(1,727
)
(1,800
)
Employee benefit plans expense (recovery)
$
2,778

$
(61
)
$
2,717

 
$
3,463

$
92

$
3,555
Summary of Principal Actuarial Assumptions
The principal actuarial assumptions used were as follows:
 
2019
 
2018
 
Employee benefit plans
 
SERP
 
Employee benefit plans
 
SERP
 
Greece

Turkey

Canada
 
Canada
 
Greece

Turkey

Canada
 
Canada
 
%

%

%
 
%
 
%

%

%
 
%
 
 
 
 
 
 
 
 
 
 
 
 
Expected return on plan assets
—

—

3.9
 
3.9
 
—

—

3.4
 
3.4
Discount rate - beginning of year
1.7

15.0

3.9
 
3.9
 
1.7

11.0

3.4
 
3.4
Discount rate - end of year
0.9

13.0

3.1
 
3.1
 
1.7

15.0

3.9
 
3.9
Rate of salary escalation
2.7

8.2

2.0
 
2.0
 
2.8

9.0

2.0
 
2.0
Average remaining service period of active employees expected to receive benefits
—

—

0.6 years
 
0.6 years
 
—

—

1.6 years
 
1.6 years
Summary of Defined Benefit Plans' Weighted Average Asset Allocation Percentages by Asset Category
The following table summarizes the defined benefit plans’ weighted average asset allocation percentages by asset category:
 
December 31, 2019
 
December 31, 2018
 
Employee benefit plans

SERP

 
Employee benefit plans

SERP

Investment funds
 
 
 
 
 
   Money market
2
%
7
%
 
2
%
1
%
   Canadian fixed income
98
%
—
%
 
98
%
6
%
   Canadian equities
—

—
%
 
—

22
%
   US equities
—

—
%
 
—

10
%
   International equities
—

—
%
 
—

12
%
Other (1)
—

93
%
 
—

49
%
 
100
%
100
%
 
100
%
100
%

(1)
Assets held by the Canada Revenue Agency in the refundable tax account

Summary of Sensitivity of the Overall Pension Obligation to Changes in the Weighted Principal Assumptions
The sensitivity of the overall pension obligation to changes in the weighted principal assumptions is:
 
Change in assumption
Impact on overall obligation
Discount rate
Increase by 0.5%
Decrease by $1,270
 
Decrease by 0.5%
Increase by $1,422
Salary escalation rate
Increase by 0.5%
Increase by $1,199
 
Decrease by 0.5%
Decrease by $1,080