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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2015
Long-Term Debt [Abstract]  
Summary Of Long-Term Debt By Contractual Maturity And Callable Features
  December 31, 2015                
    Total             Range of    
Maturity   Principal Rate     Interest Rates  
 
2017 $ 52,500 2.21 %   0.99 %   to 4.50 %
2018   12,000 1.65 %   1.15 %   to 2.25 %
2019   50,000 1.94 %   1.66 %   to 2.15 %
2020   20,000 1.83 %   1.60 %   to 2.45 %
2021 and thereafter   1,382 2.27 %   1.85 %   to 2.43 %
Total long-term debt $ 135,882 2.01 %              
December 31, 2014
    Total     Range of  
Maturity   Principal Rate   Interest Rates  
 
2016 $ 11,000 1.60 % 1.17 % to 2.29 %
2017   52,500 2.21 % 0.99 % to 4.50 %
2018   12,000 1.65 % 1.15 % to 2.25 %
2019   50,000 1.94 % 1.66 % to 2.15 %
2020 and thereafter   3,000 2.44 % 2.43 % to 2.45 %
Total long-term debt $ 128,500 2.01 %          
 
December 31, 2015
 
    Total         Range of  
Maturity   Principal   Rate     Interest Rates  
 
2017 $ 15,000   4.19 %   3.69 % to   4.50 %
2018   2,000   2.25 %   2.25 % to   2.25 %
2019 -- --   --   to --  
2020 -- --   --   to --  
2021 and thereafter -- --   --   to --  
Total long-term debt $ 17,000   3.96 %              

 

December 31, 2014
 
        Weighted                
    Total   Average     Range of  
    Principal   Rate     Interest Rates  
2016 -- --   --          
2017 $ 15,000   4.19 %   3.69 % to   4.50 %
2018   2,000   2.25 %   2.25 % to   2.25 %
2019 -- --   --   to --  
2020 and thereafter -- --   --   to --  
Total long-term debt $ 17,000   3.96 %