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Short-Term and Long-Term Debt (Revolving Credit Lines) (Details) - USD ($)
1 Months Ended 9 Months Ended
Oct. 31, 2011
Sep. 30, 2015
Apr. 28, 2015
Dec. 31, 2014
Oct. 08, 2010
RBS Citizens [Member]          
Debt Instrument [Line Items]          
Line of credit, maximum borrowing amount     $ 525,000   $ 450,000
Debt interest rate   3.20% 3.61%    
Interest rate additional rate above LIBOR 3.00%        
Credit facility, amount outstanding   $ 11,536   $ 19,522  
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Revolving credit facility, expiration date   May 31, 2016      
Revolving Credit Facility [Member] | RBS Citizens [Member]          
Debt Instrument [Line Items]          
Line of credit, maximum borrowing amount   $ 800,000      
Debt interest rate   3.96%      
Interest rate additional rate above LIBOR   3.75%      
Credit facility, amount outstanding   $ 0   $ 0