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Line of Credit (Details) - Line of Credit - USD ($)
$ in Thousands
Jan. 31, 2014
Sep. 30, 2015
Line of credit    
Maximum borrowing capacity $ 100,000  
Term of debt 5 years  
Line of credit, amount outstanding   $ 0
Prime Rate    
Line of credit    
Interest rate base prime rate  
Interest rate spread added to base rate (as a percent) 0.25%  
Federal Funds Rate    
Line of credit    
Interest rate base Federal Funds Rates  
Interest rate spread added to base rate (as a percent) 0.75%  
LIBOR    
Line of credit    
Interest rate base LIBOR  
Interest rate spread added to base rate (as a percent) 1.25%