Credit Facility - February 2015 Amended Credit Facility (Details)
1 Months Ended
Feb. 28, 2015
USD ($)
Dec. 31, 2015
USD ($)
Letter of Credit    
Line of Credit Facility [Line Items]    
Revolving credit facility $ 10,000,000  
Third Amended Credit Facility    
Line of Credit Facility [Line Items]    
Revolving credit facility 35,000,000  
Increase in revolving credit facility (up to) 15,000,000.0  
Aggregate maximum of revolving credit facility $ 50,000,000  
Adjusted quick ratio (at least) 1.5  
Maximum consolidated leverage ratio, upper end of the range 3.00  
Maximum consolidated leverage ratio, lower end of the range 2.50  
Fixed charge coverage ratio (at least) 1.25  
Outstanding amount under the credit facility   $ 0
Amount available under the credit facility   30,400,000
Letters of credit outstanding under the subfacility   $ 4,600,000
Third Amended Credit Facility | Minimum    
Line of Credit Facility [Line Items]    
Unused revolving line facility fee (as a percent) 0.00%  
Third Amended Credit Facility | Maximum    
Line of Credit Facility [Line Items]    
Unused revolving line facility fee (as a percent) 0.20%  
Third Amended Credit Facility | Prime Rate | Minimum    
Line of Credit Facility [Line Items]    
Interest rate (0.25%)  
Third Amended Credit Facility | Prime Rate | Maximum    
Line of Credit Facility [Line Items]    
Interest rate 0.50%  
Third Amended Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum    
Line of Credit Facility [Line Items]    
Interest rate 1.75%  
Third Amended Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum    
Line of Credit Facility [Line Items]    
Interest rate 2.50%