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Short-Term and Long-Term Debt (Revolving Credit Lines) (Details) (Revolving Credit Facility [Member], USD $)
1 Months Ended 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jul. 26, 2011
RBS Citizens [Member]
Jun. 30, 2013
RBS Citizens [Member]
Debt Instrument [Line Items]        
Line of credit, maximum borrowing amount $ 194,680 $ 349,976 $ 1,000,000  
Interest rate additional rate above LIBOR     3.75% 3.94%
Revolving credit facility, expiration date       Mar. 31, 2013
Credit facility, amount outstanding $ 69,993