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Short-Term and Long-Term Debt (Term Note) (Details) (Stand-By Term Note, Rbs Citizens [Member], USD $)
1 Months Ended
Oct. 31, 2011
Mar. 31, 2013
Dec. 31, 2012
Oct. 08, 2010
Stand-By Term Note | Rbs Citizens [Member]
       
Debt Instrument [Line Items]        
Line of credit, maximum borrowing amount       $ 450,000
Debt instrument, monthly principal payment 887      
Credit facility, amount outstanding   $ 38,157 $ 40,819