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Pension And Postretirement Benefit Plans (Narrative) (Details) (USD $)
 12 Months Ended 24 Months Ended
Dec. 31, 2012
employee
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]        
Recognized loss on distribution of plan's assets   $ 589,000    
Expense for purchase of employee retirement annuities   141,000    
Retired employees receiving health care and life insurance benefits 6      
Post retirement benefits, age eligibility requirement 65 years      
Post retirement benefits, service eligibility requirement 15 years      
Net periodic benefit cost 500,000      
Recognized transition obligation 3,000      
Accumulated benefit obligation for the pension plan     3,700,000  
Unrecognized net actuarial gain 44,000      
Benefit obligation weighted average discount rate     6.10%  
Net periodic benefit cost, weighted average discount rate   6.10% 5.00%  
Expected long-term return on plan assets     5.00% 5.00%
Annual rate of increase in cost of covered health care benefits, next fiscal year 10.00%      
Annual rate of increase in cost of covered health care benefits, two fiscal years 0.00%      
Annual rate of increase in cost of covered health care benefits, three fiscal years 8.00%      
Annual rate of increase in cost of covered health care benefits, four fiscal years 0.00%      
Annual rate of increase in cost of covered health care benefits, five fiscal years and thereafter 6.00%      
Benefit obligation increase (decrease) 6,000      
Pension Plan [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit cost   731,000 278,000  
Unrecognized net actuarial gain   143,000 (246,000)  
Postretirement Benefits Plan [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit cost (3,000) (5,000)    
Unrecognized net actuarial gain $ 2,000 $ 6,000 $ (11,000)  
Benefit obligation weighted average discount rate 3.50% 4.25% 5.00% 4.25%