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Long-Term Debt (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2013
F&M Bank [Member]
Mar. 06, 2013
F&M Bank [Member]
Mar. 05, 2013
F&M Bank [Member]
Dec. 31, 2012
F&M Bank [Member]
Mar. 31, 2013
Maximum [Member]
Mar. 04, 2013
Maximum [Member]
F&M Bank [Member]
Mar. 31, 2013
Minimum [Member]
Mar. 04, 2013
Minimum [Member]
F&M Bank [Member]
Line of Credit Facility [Line Items]                  
Credit facility maximum borrowing capacity   $ 40              
Credit facility current borrowing capacity 20.5   20.5 21.5          
Interest rate per annum   5.25%       8.25%   5.50% 5.25%
Rate above prime             0.25%    
Credit facility maturity date Jan. 27, 2015                
Loans and letters of credit amount outstanding   $ 8.2     $ 10.1