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Employee Retirement and Pension Benefits
 9 Months Ended
Sep. 26, 2020
Retirement Benefits [Abstract]  
Employee Retirement and Pension Benefits Employee Retirement and Pension Benefits
U.S. Defined Benefit Pension Plan – Certain U.S. hourly employees participate in our defined benefit pension plan. The plan is not open to new employees. Pension expense, as recorded in the accompanying unaudited consolidated statements of operations, is determined by using spot rate assumptions made on January 1 of each year as summarized below:
Three Months EndedNine Months Ended
(amounts in thousands)September 26, 2020September 28, 2019September 26, 2020September 28, 2019
Components of pension benefit expense - U.S. benefit plan:
Administrative cost
$775 $1,250 $2,325 $3,750 
Interest cost
3,050 3,725 9,150 11,175 
Expected return on plan assets
(5,475)(4,650)(16,425)(13,950)
Amortization of net actuarial pension loss
1,725 2,225 5,175 6,675 
Pension benefit expense$75 $2,550 $225 $7,650 

During the three and nine months ended September 26, 2020, we made required contributions to our U.S. defined benefit pension plan or “Plan”, of $1.1 million and $2.7 million, respectively, and voluntary contributions of $1.7 million. During
the three and nine months ended September 28, 2019, we made required contributions to the Plan of $3.1 million and $6.1 million, respectively, and voluntary contributions of $0.1 million. We have no additional required contributions for the Plan in 2020.During the three months ended June 27, 2020, we elected to utilize the alternative method when calculating the Pension Benefit Guarantee Corporation premiums for 2020 and the succeeding 4 years, rather than the standard method utilized during the previous 5 years, resulting in a reduction to pension benefit expenses in the nine month period ending September 26, 2020.