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Employee future benefits (Tables)
 12 Months Ended
Dec. 31, 2018
Employee Benefits [Abstract]  
Disclosure of net defined benefit liability (asset)
 
Defined benefit obligation
 
 
Fair value of plan assets
 
 
Net defined benefit liability
 
Defined benefit pension plan
2018

 
2017

 
2018

 
2017

 
2018

 
2017

Balance at January 1
$
17,603

 
$
16,253

 
$
(12,809
)
 
$
(11,282
)
 
$
4,794

 
$
4,971

Included in profit or loss
 
 
 
 
 
 
 
 
 
 
 
Current service cost
57

 
32

 
—

 
—

 
57

 
32

Interest cost (income)
621

 
658

 
(455
)
 
(464
)
 
166

 
194

Benefits payable
—

 
—

 
—

 
—

 
—

 
—

 
678

 
690

 
(455
)
 
(464
)
 
223

 
226

Included in other comprehensive income
 
 
 
 
 
 
 
 
 
 
 
Remeasurements loss (gain):
 
 
 
 
 
 
 
 
 
 
 
Actuarial loss (gain) arising from:
 
 
 
 
 
 
 
 
 
 
 
Demographic assumptions
(49
)
 
(99
)
 
—

 
—

 
(49
)
 
(99
)
Financial assumptions
(1,331
)
 
1,300

 
—

 
—

 
(1,331
)
 
1,300

Experience adjustment
(2
)
 
111

 
—

 
—

 
(2
)
 
111

Return on plan assets excluding interest
—

 
—

 
1,075

 
(1,055
)
 
1,075

 
(1,055
)
income
 
 
 
 
 
 
 
 
 
 
 
Plan expenses
(35
)
 
(55
)
 
35

 
55

 
—

 
—

 
(1,417
)
 
1,257

 
1,110

 
(1,000
)
 
(307
)
 
257

Other
 
 
 
 
 
 
 
 
 
 
 
Contributions paid by the employer
—

 
—

 
(495
)
 
(660
)
 
(495
)
 
(660
)
Benefits paid
(609
)
 
(597
)
 
609

 
597

 
—

 
—

 
(609
)
 
(597
)
 
114

 
(63
)
 
(495
)
 
(660
)
Balance at December 31
$
16,255

 
$
17,603

 
$
(12,040
)
 
$
(12,809
)
 
$
4,215

 
$
4,794











19.
Employee future benefits (cont'd):
 
Defined benefit obligation
 
 
Fair value of plan assets
 
 
Net defined benefit liability
 
Other post-retirement benefit plan
2018

 
2017

 
2018

 
2017

 
2018

 
2017

Balance at January 1
$
120

 
$
196

 
$
—

 
$
—

 
$
120

 
$
196

Included in profit or loss
 
 
 
 
 
 
 
 
 
 
 
Interest cost (income)
3

 
4

 
—

 
—

 
3

 
4

 
3

 
4

 
—

 
—

 
3

 
4

Included in other comprehensive income
 
 
 
 
 
 
 
 
 
 
 
Remeasurements loss (gain):
 
 
 
 
 
 
 
 
 
 
 
Actuarial loss (gain) arising from:
 
 
 
 
 
 
 
 
 
 
 
Demographic assumptions
—

 
(1
)
 
—

 
—

 
—

 
(1
)
Financial assumptions
(5
)
 
3

 
—

 
—

 
(5
)
 
3

Experience adjustment
7

 
(53
)
 
—

 
—

 
7

 
(53
)
 
2

 
(51
)
 
—

 
—

 
$
2

 
$
(51
)
Other
 
 
 
 
 
 
 
 
 
 
 
Contributions paid by the employer
—

 
—

 
(41
)
 
(29
)
 
(41
)
 
(29
)
Benefits paid
(41
)
 
(29
)
 
41

 
29

 
—

 
—

 
(41
)
 
(29
)
 
—

 
—

 
(41
)
 
(29
)
Balance at December 31
$
84

 
$
120

 
$
—

 
$
—

 
$
84

 
$
120

 
December 31, 2018

 
December 31, 2017

Net defined benefit pension plan liability
$
4,215

 
$
4,794

Net other post-retirement benefit plan liability
84

 
120

Employee future benefits
$
4,299

 
$
4,914
Disclosure of comprehensive income by plan type
Included in other comprehensive income (loss)
December 31, 2018

 
December 31, 2017

Defined benefit pension plan actuarial gain (loss)
$
307

 
$
(257
)
Other post-retirement benefit plan actuarial gain (loss)
(2
)
 
51

 
$
305

 
$
(206
)
Disclosure of fair value of plan assets
Pension plan assets comprise:
 
2018

 
2017

Cash and cash equivalents
3
%
 
3
%
Equity securities
59
%
 
60
%
Debt securities
38
%
 
37
%
Total
100
%
 
100
%
Disclosure of defined benefit plans
The significant actuarial assumptions adopted in measuring the fair value of benefit obligations at December 31 were as follows:
 
 
 
2018

 
 
 
2017

 
Pension plan

 
Other benefit plan

 
Pension plan

 
Other benefit plan

Discount rate
4.16
%
 
3.96
%
 
3.60
%
 
3.27
%
Rate of compensation increase
n/a

 
n/a

 
n/a

 
n/a

The significant actuarial assumptions adopted in determining net expense for the years ended December 31 were as follows:
 
 
 
2018

 
 
 
2017

 
Pension plan

 
Other benefit plan

 
Pension plan

 
Other benefit plan

Discount rate
3.60
%
 
3.96
%
 
4.13
%
 
3.27
%
Rate of compensation increase
n/a

 
n/a

 
n/a

 
n/a
Disclosure of sensitivity analysis for actuarial assumptions
The assumed health care cost trend rates applicable to the other post-retirement benefit plan at December 31 were as follows:
 
2018
 
2017

Initial medical/dental health care cost trend rate
n/a
 
8.0
%
Cost trend rate declines to medical and dental
n/a
 
5.0
%
Year that the medical rate reaches the rate it is assumed to remain at
2023
 
2022

Year that the dental rate reaches the rate it is assumed to remain at
2018
 
2017