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Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2022
Defined Benefit Plan Disclosure  
Schedule of Costs of Retirement Plans The following table summarizes the expense associated with the contributions made to these plans for the periods presented:
Three Months Ended
June 30,		Six Months Ended
June 30,
2022202120222021
United States$390 $408 $695 $772 
Canada45 40 105 86 
United Kingdom379 135 379 255 
$814 $583 $1,179 $1,113 
United States  
Defined Benefit Plan Disclosure  
Schedule of Net Benefit Costs
Net periodic pension costs for the United States defined benefit pension plan for the three and six months ended June 30, 2022 and 2021 were as follows:
Three Months Ended
June 30,		Six Months Ended
June 30,
2022202120222021
Interest cost$49 $43 $97 $86 
Expected return on plan assets(66)(62)(132)(124)
Recognized net actuarial loss18 25 35 49 
Net periodic pension cost$1 $6 $— $11 
United Kingdom  
Defined Benefit Plan Disclosure  
Schedule of Net Benefit Costs
Net periodic pension costs for the United Kingdom defined benefit pension plan for the three and six months ended June 30, 2022 and 2021 were as follows:
Three Months Ended
June 30,		Six Months Ended
June 30,
2022202120222021
Interest cost$43 $28 $86 $56 
Expected return on plan assets(76)(65)(152)(130)
Amortization of prior service costs and transition amount6 7 12 14 
Recognized net actuarial loss40 83 80 166 
Net periodic pension cost$13 $53 $26 $106