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Benefit Plans (Schedule Of Benefit Plans) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Pension Costs [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 473 $ 489 $ 946 $ 978
Interest cost 2,169 1,985 4,338 3,970
Expected return on plan assets (1,938) (1,706) (3,876) (3,412)
Amortization of prior service cost/benefit 1 6 2 12
Net cost 705 774 1,410 1,548
Postretirement Costs [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 19 28 38 56
Interest cost 352 331 704 662
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments 1,048 0 1,048 0
Amortization of prior service cost/benefit (47) (50) (94) (100)
Net cost $ 1,372 $ 309 $ 1,696 $ 618