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EMPLOYEE BENEFIT PLANS
 6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS
Components of net pension expense were as follows:
Three months ended June 30,Six months ended June 30,
 2020201920202019
 (In thousands)
Pension Benefits
Company-administered plans:
Service cost$2,741  $2,783  $5,954  $5,815  
Interest cost17,353  21,395  34,885  42,864  
Expected return on plan assets(23,948) (22,589) (48,211) (45,265) 
Amortization of:
Net actuarial loss7,437  7,432  15,152  15,042  
Prior service cost185  187  372  366  
3,768  9,208  8,152  18,822  
Union-administered plans2,798  2,701  5,577  5,158  
Net pension expense$6,566  $11,909  $13,729  $23,980  
Company-administered plans:
U.S.$6,055  $10,659  $12,833  $22,132  
Non-U.S.(2,287) (1,451) (4,681) (3,310) 
3,768  9,208  8,152  18,822  
Union-administered plans2,798  2,701  5,577  5,158  
Net pension expense$6,566  $11,909  $13,729  $23,980  
Non-operating pension costs include the amortization of net actuarial loss and prior service cost, interest cost and expected return on plan assets components of pension and postretirement benefit costs, as well as any significant charges for settlements or curtailments if recognized. During the six months ended June 30, 2020, we contributed $17 million to our pension plans. In 2020, the expected total contributions to our pension plans are approximately $37 million. We also maintain other postretirement benefit plans that are not reflected in the table above. The amount of postretirement benefit expense was not material for the six months ended June 30, 2020 and 2019.