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Benefit Plans (Schedule Of Benefit Plans) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 27, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]          
Settlement of projected benefit obligations $ 59,000        
Pension Costs [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Service cost   $ 506 $ 473 $ 1,333 $ 946
Interest cost   1,526 2,169 3,052 4,338
Expected return on plan assets   (1,354) (1,938) (2,708) (3,876)
Amortization of prior service cost/benefit   1 1 2 2
Net cost   679 705 1,679 1,410
Postretirement Costs [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Service cost   4 19 8 38
Interest cost   315 352 630 704
Amortization of prior service cost/benefit   (43) (47) (86) (94)
Net cost   $ 276 $ 1,372 $ 552 $ 1,696