Credit Facility - Additional Information (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
Debt Issuance Costs    
2016 $ (1,706,000)  
2017 (1,706,000)  
2018 (1,706,000)  
Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity under credit facilities $ 140,000,000  
Interest rate (as a percent) 5.02% 5.09%
Weighted average interest rate (as a percent) 4.95%  
Minimum unused capacity amount to avoid fixed charge coverage ratio covenant, percentage of maximum borrowing capacity 0.125  
Minimum unused capacity amount to avoid fixed charge coverage ratio covenant $ 17,500,000  
Fixed charge coverage ratio, minimum 1.1  
Debt Issuance Costs    
2016 $ (800,000)  
2017 (800,000)  
2018 $ (300,000)  
Revolving Credit Facility | Minimum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate (as a percent) 2.25%  
Revolving Credit Facility | Maximum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate (as a percent) 4.50%  
Revolving Credit Facility | 2015    
Line of Credit Facility [Line Items]    
Maximum growth capital expenditures permitted under covenant $ 10,000,000  
Revolving Credit Facility | 2016    
Line of Credit Facility [Line Items]    
Maximum growth capital expenditures permitted under covenant 20,000,000  
Revolving Credit Facility | 2017 and beyond    
Line of Credit Facility [Line Items]    
Maximum growth capital expenditures permitted under covenant 25,000,000  
Revolving Credit Facility | Standby Letters of Credit    
Line of Credit Facility [Line Items]    
Amount outstanding 1,600,000  
Maximum borrowing availability $ 22,900,000