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Senior Credit Facility (Details) - Secured Credit Facility - USD ($)
54 Months Ended
Feb. 26, 2016
Feb. 26, 2016
Feb. 03, 2018
2011 Credit Agreement      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity $ 50,000,000 $ 50,000,000  
Swingline availability 5,000,000 $ 5,000,000  
Percentage of fee on unused portion of the facility   0.375%  
2016 Credit Agreement      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity 75,000,000 $ 75,000,000  
Swingline availability $ 10,000,000 $ 10,000,000  
Percentage of fee on unused portion of the facility 0.25%    
Incremental accordion feature amount $ 25,000,000    
Outstanding borrowings     $ 0
Available borrowing capacity     $ 53,400,000
2016 Credit Agreement | Minimum      
Line of Credit Facility [Line Items]      
Interest at an annual rate equal to LIBOR plus a margin range 1.25% 1.75%  
2016 Credit Agreement | Maximum      
Line of Credit Facility [Line Items]      
Interest at an annual rate equal to LIBOR plus a margin range 2.25% 2.25%