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Defined Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 28, 2017
Jun. 29, 2016
Jun. 28, 2017
Jun. 29, 2016
Dec. 28, 2016
Components of net periodic benefit cost [Abstract]          
Pension settlement loss $ 0 $ 24,297 $ 0 $ 24,297  
Additional minimum pension liability 900   900   $ 945
Pension Plan [Member]          
Components of net periodic benefit cost [Abstract]          
Service cost 0 0 0 105  
Net periodic benefit cost 0 0 0 105  
Employer contributions   9,500      
Assets used for settlements   67,700      
Pension settlement loss   24,300      
Other Defined Benefit Plans [Member]          
Components of net periodic benefit cost [Abstract]          
Interest cost 21 23 42 46  
Amortization of net loss 23 22 46 43  
Net periodic benefit cost 44 $ 45 88 89  
Employer contributions     200 $ 100  
Estimated employer contributions remainder of current fiscal year $ 100   $ 100