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Defined Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 01, 2015
Jun. 25, 2014
Jul. 01, 2015
Jun. 25, 2014
Dec. 31, 2014
Components of net periodic benefit cost [Abstract]          
Additional minimum pension liability $ 24,500   $ 24,500   $ 25,000
Pension Plan [Member]          
Components of net periodic benefit cost [Abstract]          
Service cost 95 $ 95 190 $ 190  
Interest cost 746 771 1,492 1,550  
Expected return on plan assets (877) (988) (1,754) (1,977)  
Amortization of net loss 433 231 866 462  
Net periodic benefit cost 397 109 794 225  
Employer contributions     0 1,300  
Other Defined Benefit Plans [Member]          
Components of net periodic benefit cost [Abstract]          
Interest cost 27 31 54 62  
Amortization of net loss 19 16 39 31  
Settlement loss recognized 0 25 0 25  
Net periodic benefit cost $ 46 $ 72 93 118  
Estimated employer contributions remainder of current fiscal year     100    
Employer contributions     100 $ 200  
Minimum [Member] | Pension Plan [Member]          
Components of net periodic benefit cost [Abstract]          
Estimated employer contributions remainder of current fiscal year     6,000    
Maximum [Member] | Pension Plan [Member]          
Components of net periodic benefit cost [Abstract]          
Estimated employer contributions remainder of current fiscal year     $ 9,000