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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Components of net periodic benefit cost
The components of net periodic benefit cost include the following:
Three Months Ended
March 31, 2019April 1, 2018
Retirement Plans
Service cost$941 $4,672 
Interest cost14,943 13,978 
Expected return on plan assets(19,097)(23,209)
Amortization of prior service cost214 249 
Amortization of net actuarial loss9,034 9,420 
Effect of settlement loss1,322 — 
Net periodic benefit cost$7,357 $5,110 
Retiree Health and Life Insurance Plans
Service cost$74 $79 
Interest cost118 111 
Expected return on plan assets(177)(472)
Amortization of prior service credit(123)(126)
Amortization of net actuarial gain(193)(242)
Net periodic benefit income$(301)$(650)