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Pension Plans (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pension Plans      
Fair values of pension assets $ 12,558,000 $ 11,239,000 $ 9,758,000
Liability for pension benefits 6,983,000 5,570,000  
Excess plan
     
Pension Plans      
Fair values of pension assets 239,000 213,000  
SERP
     
Pension Plans      
Liability for pension benefits $ 100,000