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Pension And Postretirement Benefit Plans (Reconciliation Of The Changes In The Benefit Obligations) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss (gain) $ 44    
Employer contributions 867 739 668
Pension Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, beginning   3,684 3,801
Interest cost   101 189
Actuarial loss (gain)   143 (246)
Benefits paid   (4,069) (60)
Settlement loss   141  
Benefit obligation, ending     3,684
Fair value of plan assets, beginning   3,252 2,955
Actual return on plan assets   87 78
Employer contributions   730 279
Fair value of plan assets, ending     3,252
Postretirement Benefits Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, beginning 150 144 154
Interest cost 5 6 7
Actuarial loss (gain) 2 6 (11)
Benefits paid (7) (6) (6)
Benefit obligation, ending 150 150 144
Employer contributions $ 7 $ 6 $ 6