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Pension And Postretirement Benefit Plans (Net Periodic Benefit Cost Of The Pension Plan And Postretirement Benefit Plan) (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]      
Net periodic benefit cost $ 500    
Pension Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Interest cost   101 189
Expected return on plan assets   (83) (146)
Recognized net loss due to settlement   141  
Amortization of net actuarial loss   572 235
Net periodic benefit cost   731 278
Postretirement Benefits Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Interest cost 5 6 7
Amortization of transition obligation     2
Amortization of net actuarial loss (8) (11) (9)
Net periodic benefit cost $ (3) $ (5)