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Employee Benefit Plans
 3 Months Ended
Mar. 26, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Employee Benefit Plans Employee Benefit Plans
The Company has defined benefit pension and other long-term and postretirement plans covering certain union and non-union employees, primarily in the U.S. and Canada. The defined benefit pension plans are closed to new participants. The liabilities for these plans are calculated using actuarial estimates and management assumptions. These estimates are based on historical information, along with certain assumptions about future events.
The components of net periodic benefit costs from these plans that have been recorded are shown in the following table:
PensionPostretirement
Three Months EndedThree Months Ended
Components of Net Periodic Benefit CostMarch 26, 2022March 27, 2021March 26, 2022March 27, 2021
Service cost$2,176 $2,551 $353 $362 
Interest cost4,606 4,418 216 176 
Expected return on plan assets(8,328)(9,623)— — 
Amortization of prior service cost39 176 (31)(38)
Amortization of losses2,473 4,079 15 3 
Total net periodic benefit cost$966 $1,601 $553 $503 
Service cost is included in cost of sales and selling, general and administrative expenses in the statements of income, as appropriate. Interest cost, expected return on plan assets, amortization of prior service cost and amortization of losses are included in other components of pension and OPEB, excluding service cost on the consolidated statement of income.