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Long-Term Debt (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Oct. 24, 2013
Sep. 30, 2013
Dec. 31, 2012
F&M Bank [Member]
      
Debt Instrument [Line Items]      
Credit facility maximum borrowing capacity   $ 40  
Credit facility current borrowing capacity   20.5  
Decreased borrowing base 17.5    
Interest rate per annum   5.25%  
Rate above prime 0.50% 0.25%  
Loans and letters of credit amount outstanding   $ 3.0 $ 10.1
Maximum [Member]
      
Debt Instrument [Line Items]      
Interest rate per annum   8.25% 8.25%
Minimum [Member]
      
Debt Instrument [Line Items]      
Interest rate per annum   5.50% 5.50%
Minimum [Member] | F&M Bank [Member]
      
Debt Instrument [Line Items]      
Interest rate per annum   5.25%