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Short-term and Long-term Debt - Line of Credit (Details) (USD $)
6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Revolving line of credit
Dec. 31, 2013
Revolving line of credit
Jun. 30, 2014
Revolving line of credit
Minimum
Jun. 30, 2014
Revolving line of credit
Selected LIBOR rate
Jun. 30, 2014
Revolving line of credit
LIBOR for a fixed rate term
Line of Credit Facility [Line Items]            
Line of credit amount   $ 30,000,000        
Line of credit outstanding balance   0 0      
Interest rate on line of credit, variable rate         1.75% 1.50%
Minimum tangible net worth required       225,000,000    
Liquid assets       25,000,000    
Tangible net worth   327,966,000        
Liquid Assets $ 74,542,000 $ 19,800,000