Long-Term Debt (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012 F&M Bank [Member]	Sep. 12, 2012 F&M Bank [Member]	Mar. 14, 2012 F&M Bank [Member]	Dec. 31, 2011 F&M Bank [Member]	Sep. 30, 2012 Maximum [Member]	Mar. 14, 2012 Maximum [Member] F&M Bank [Member]	Sep. 30, 2012 Minimum [Member]	Mar. 14, 2012 Minimum [Member] F&M Bank [Member]
Line of Credit Facility [Line Items]
Credit facility current borrowing capacity		$ 40
Borrowing base			23.0	20.0
Increased borrowing base				23
Decreased borrowing base			21.5
Interest rate per annum			5.25%			8.25%	5.25%	5.50%
Rate above prime									0.25%
Credit facility maturity date	Jan. 27, 2014
Loans and letters of credit amount outstanding		$ 11.4			$ 11.5