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Defined benefit plans (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Summary of Defined Benefit Plans
         December 31, 2017          December 31, 2016  
     $      $  

Balance sheet obligations (asset) for:

      

Pension Plan

      13,599        10,882  

Supplemental Pension Plan

      (9,919)        (11,620)  
     December 31, 2017      December 31, 2016  
     $      $  

Income statement charge for:

      

Pension plan

      2,841        4,409  

Supplemental Pension Plan

      610        1,193  
     3,451        5,602  

Actuarial losses (gains) recognised in the statement of other comprehensive income in the period (before tax)

      3,121        1,188  

Cumulative actuarial losses recognised in the statement of other comprehensive income (before tax)

      18,641        15,520    
Summary of Amounts Recognised in the Balance Sheet for All Pension Plans

The amounts recognised in the balance sheet for all pension plans are determined as follows:

 

     December 31, 2017             December 31, 2016         
     Pension Plan      SERP      Total      Pension Plan      SERP      Total  
     $      $      $      $      $      $  

Present value of obligations

      16,028        43,956        59,984        12,936        37,686        50,622  

Fair value of plan assets

      (2,429)        (53,875)        (56,304)        (2,054)        (49,306)        (51,360)  

Liability (asset) on balance sheet

      13,599        (9,919)        3,680        10,882        (11,620)        (738)  
Summary of Movement in the Defined Benefit Obligation Over the Year

The movement in the defined benefit obligation over the year is as follows:

 

     2017                     2016                 
     Pension Plan      SERP      Total      Pension Plan      SERP      Total   
     $      $      $      $      $      $   

Balance at January 1,

      12,936        37,686        50,622        8,688        31,565        40,253  

Current service cost

      2,102        877        2,979        520        1,483        2,003  

Past service cost

      206        208        414        3,494        193        3,687  

Interest cost

      620        1,508        2,128        476        1,340        1,816  

Actuarial loss (gain)

      292        2,390        2,682        445        1,939        2,384  

Benefit payments

      (1,060 )       (1,485 )       (2,545 )       (26 )       (445 )       (471 ) 

Exchange (gain) loss

      932        2,772        3,704        (661 )       1,611        950  

Balance at December 31,

      16,028        43,956        59,984        12,936        37,686        50,622  
Summary of Movement in the Fair Value of Plan Assets of the Year

The movement in the fair value of plan assets of the year is as follows:

 

     2017                     2016                 
     Pension Plan      SERP      Total      Pension Plan      SERP      Total  
     $      $      $      $      $      $  

At January 1,

      2,054        49,306        51,360        1,968        43,016        44,984  

Interest income on plan assets

      86        1,983        2,069        81        1,823        1,904  

Actuarial gain (loss)

      (55)        (384)        (439)        (32)        (1,164)        (1,196)  

Contributions by employer

      219        1,196        1,415        -        1,728        1,728  

Benefit payments

      (57)        (1,485)        (1,542)        (26)        (445)        (471)  

Exchange gain

      182        3,259        3,441        63        4,348        4,411  

At December 31,

      2,429        53,875        56,304        2,054        49,306        51,360  
Summary of Amounts Recognised in the Income Statement

The amounts recognised in the income statement are as follows:

 

     2017                     2016                 
     Pension Plan      SERP      Total      Pension Plan      SERP      Total  
     $      $      $      $      $      $  

Current service cost

      2,102        877        2,979        520        1,483        2,003  

Interest cost

      620        1,508        2,128        476        1,340        1,816  

Past Service Cost

      206        208        414        3,494        193        3,687  

Expected return on plan assets

      (87 )       (1,983 )       (2,070 )       (81 )       (1,823 )       (1,904 ) 

Defined benefit plans expense

      2,841        610        3,451        4,409        1,193        5,602  
Summary of Principal Actuarial Assumptions

The principal actuarial assumptions used were as follows:

 

     2017      2016  
     Pension Plan      SERP      Pension Plan      SERP  
     Greece      Turkey      Canada      Canada      Greece      Turkey      Canada         
     %      %      %      %      %      %      %      %  
Expected return on plan assets      -        -        3.9        3.9        -        -        3.9        3.9  
Discount rate - beginning of year      1.6        10.5        3.9        3.9        2.0        10.5        4.0        4.0  
Discount rate - end of year      1.7        11.0        3.4        3.4        1.6        10.5        3.9        3.9  
Rate of salary escalation      2.8        6.5        2.0        2.0        2.8        6.0        2.0        2.0  
Average remaining service period of active employees expected to receive benefits      -        -        8.2 years        8.2 years        -        -        7.1 years        7.1 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, 2017     December 31, 2016      
     Pension Plan     SERP     Pension Plan     SERP                 

Investment funds

           

Money market

      0 %      6 %      2 %      3 %   

Canadian fixed income

      100 %      2 %      98 %      4 %   

Canadian equities

      -      20 %      -      21 %   

US equities

      -      19 %      -      20 %   

International equities

      -      7 %      -      8 %   

Other (1)

      -      46 %      -      44 %   

Total

                          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 $2,855

   
  

Decrease by 0.5%

   

Increase by $3,157

   

Salary escalation rate

   

Increase by 0.5%

   

Increase by $8

   
  

Decrease by 0.5%

   

decrease by $14