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Pension and Postretirement Benefits
9 Months Ended
Oct. 01, 2017
Pension and Postretirement Benefits (Thousands of Dollars) [Abstract]  
Pension and Postretirement Benefits

(7) Pension and Postretirement Benefits

The components of the net periodic cost of the Company's defined benefit pension and other postretirement plans for the quarter and nine-month periods ended October 1, 2017 and September 25, 2016 are as follows:

Quarter Ended
PensionPostretirement
October 1,September 25,October 1,September 25,
2017201620172016
Service cost$9251,002172132
Interest cost4,4434,611295294
Expected return on assets(5,896)(5,512)--
Net amortization and deferrals2,5252,134--
Net periodic benefit cost$1,9972,235467426

Nine Months Ended
PensionPostretirement
October 1,September 25,October 1,September 25,
2017201620172016
Service cost$2,7982,995517397
Interest cost13,59813,821885881
Expected return on assets(18,057)(16,523)--
Net amortization and deferrals7,7386,398--
Net periodic benefit cost$6,0776,6911,4021,278

During the nine months ended October 1, 2017, the Company made cash contributions of $26,600 to its defined benefit pension plans. During fiscal 2017, the Company expects to make cash contributions to its defined benefit pension plans of approximately $29,000 in the aggregate.