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Supplemental Retirement Benefits (Details) (Supplemental Retirement Benefits, USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Supplemental Retirement Benefits
     
Supplemental retirement benefits      
Expenses related to supplemental retirement benefits $ 17,000 $ 32,000 $ 6,000
Discount rate for calculating present value of the supplemental retirement obligation (as a percent) 8.50%    
Total projected future cash payments      
2014 46,000    
2015 25,000    
2016 25,000    
2017 25,000    
2018 25,000    
Thereafter $ 25,000