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Employee Benefit Plans (Change in Plan Assets and Funded Status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 25, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Lump-sum settlement payment $ 31,616   $ 31,616  
Pension Benefits [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Benefit obligation - Beginning of year   $ 53,293 53,440  
Service cost    
Interest cost   1,786 2,329 $ 2,319
Actuarial loss (gain)   2,599 1,222  
Benefits paid   (3,629) (3,778)  
Lump-sum settlement payment    
Settlement gain    
Plan curtailment   (51)  
Special termination benefits   270 131  
Benefit obligation - End of year   54,319 53,293 53,440
Plan assets - Beginning of year   46,472 46,767  
Return on plan assets   5,713 3,483  
Employer contributions    
Benefits paid   (3,629) (3,778)  
Lump-sum settlement payment    
Plan assets at fair value - End of year   48,556 46,472 46,767
Funded status of plans - End of year   (5,763) (6,821)  
Postretirement Benefit Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Benefit obligation - Beginning of year   6,172 72,902  
Service cost   48 60 70
Interest cost   199 934 2,970
Actuarial loss (gain)   (74) 1,586  
Benefits paid   (539) (488)  
Lump-sum settlement payment   (31,616)  
Settlement gain   (37,190)  
Plan curtailment   (32)  
Special termination benefits   150 16  
Benefit obligation - End of year   5,956 6,172 72,902
Plan assets - Beginning of year    
Return on plan assets    
Employer contributions   539 32,104  
Benefits paid   (539) (488)  
Lump-sum settlement payment   (31,616)  
Plan assets at fair value - End of year  
Funded status of plans - End of year   $ (5,956) $ (6,172)