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Supplemental Retirement Benefits (Details) (Supplemental Retirement Benefits, USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Supplemental Retirement Benefits
     
Supplemental retirement benefits      
Expenses related to supplemental retirement benefits $ 32,000 $ 6,000 $ 30,000
Discount rate for calculating present value of the supplemental retirement obligation (as a percent) 8.50%    
Total projected future cash payments      
2013 75,000    
2014 45,833    
2015 25,000    
2016 25,000    
2017 25,000    
Thereafter $ 50,000