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Short-Term and Long-Term Debt (Revolving Credit Lines) (Details) - USD ($)
1 Months Ended 6 Months Ended
Oct. 31, 2011
Jun. 30, 2015
Jun. 29, 2015
Apr. 28, 2015
Dec. 31, 2014
Oct. 08, 2010
Debt Instrument [Line Items]            
Credit facility, amount outstanding     $ 509,009      
RBS Citizens [Member]            
Debt Instrument [Line Items]            
Line of credit, maximum borrowing amount       $ 525,000   $ 450,000
Debt interest rate       3.61%    
Interest rate additional rate above LIBOR 3.00% 3.18%        
Credit facility, amount outstanding   $ 14,197     $ 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   3.93%        
Interest rate additional rate above LIBOR   3.75%        
Credit facility, amount outstanding   $ 0     $ 0