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Retirement Agreements And Other Postretirement Benefit Plan (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
H
Dec. 31, 2011
Dec. 31, 2010
Minimum number of years employed in order to participate in the 401(k) plan 1 year    
Minimum number of hours worked annually in order to participate in the 401(k) plan 1,000    
Definded contribution plan contribution percent 3.00%    
Expenses related to the 401(k) plan $ 518,000 $ 479,000  
Amount accrued for all deferred compensation plan agreements 6,303,000 5,740,000  
Expected future benefit payouts expected to be paid for 2013 3,993    
Expected future benefit payouts expected to be paid for 2014 4,462    
Expected future benefit payouts expected to be paid for 2015 4,930    
Expected future benefit payouts expected to be paid for 2016 5,395    
Expected future benefit payouts expected to be paid for 2017 9,489    
Expected future benefit payouts expected to be paid for the next five years thereafter 100,231    
Amount recognized in accumulated other comprehensive income, before tax (155,234) (82,392) 19,977
Amount recognized in accumulated other comprehensive income, net of tax $ (102,453) $ (54,376)  
Minimum [Member]
      
Employee agreement 2 years