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Pension And Other Post-Retirement Benefits (Schedule Of Components Of Net Periodic Benefit Cost For Pension And Other Post-Retirement Benefit Programs) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Pension Benefits [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ (870) $ (857) $ (1,740) $ (1,715)
Interest cost (3,108) (3,288) (6,214) (6,577)
Expected return on plan assets 4,329 4,811 8,658 9,622
Amortization of prior service costs, gains or losses and net transition asset (3,689) (2,627) (7,379) (5,253)
Net periodic benefit cost (3,338) (1,961) (6,675) (3,923)
Other Post-Retirement Benefits [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost (17) (13) (35) (26)
Interest cost (88) (101) (177) (201)
Amortization of prior service costs, gains or losses and net transition asset 40 53 81 106
Net periodic benefit cost $ (65) $ (61) $ (131) $ (121)