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Defined Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 24, 2014
Sep. 30, 2015
Sep. 24, 2014
Dec. 31, 2014
Components of net periodic benefit cost [Abstract]          
Additional minimum pension liability $ 24,200   $ 24,200   $ 25,000
Pension Plan [Member]          
Components of net periodic benefit cost [Abstract]          
Service cost 95 $ 95 285 $ 285  
Interest cost 745 775 2,237 2,325  
Expected return on plan assets (877) (988) (2,631) (2,965)  
Amortization of net loss 434 231 1,300 693  
Net periodic benefit cost 397 113 1,191 338  
Employer contributions     0 2,500  
Other Defined Benefit Plans [Member]          
Components of net periodic benefit cost [Abstract]          
Interest cost 26 31 80 93  
Amortization of net loss 20 15 59 46  
Settlement loss recognized 0 33 0 58  
Net periodic benefit cost $ 46 $ 79 139 197  
Employer contributions     100 $ 400  
Estimated employer contributions remainder of current fiscal year     100    
Minimum [Member] | Pension Plan [Member]          
Components of net periodic benefit cost [Abstract]          
Estimated employer contributions in next fiscal year     6,000    
Maximum [Member] | Pension Plan [Member]          
Components of net periodic benefit cost [Abstract]          
Estimated employer contributions in next fiscal year     $ 9,000