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Pension and Postretirement Benefits
6 Months Ended
Jun. 26, 2016
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 six-month periods ended June 26, 2016 and June 28, 2015 are as follows:

Quarter Ended
PensionPostretirement
June 26,June 28,June 26,June 28,
2016201520162015
Service cost$9951,021133150
Interest cost4,6044,619293285
Expected return on assets(5,504)(5,497)--
Net amortization and deferrals2,1322,207-(114)
Curtailment-138--
Net periodic benefit cost$2,2272,488426321

Six Months Ended
PensionPostretirement
June 26,June 28,June 26,June 28,
2016201520162015
Service cost$1,9932,032265300
Interest cost9,2109,224587570
Expected return on assets(11,011)(10,976)--
Net amortization and deferrals4,2644,408-(228)
Curtailment-138--
Net periodic benefit cost$4,4564,826852642

During the six months ended June 26, 2016, the Company made cash contributions to its defined benefit pension plans of approximately $750 in the aggregate. The Company expects to contribute approximately $2,750 during the remainder of fiscal 2016.