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Lines of Credit and Long-Term Debt - Lines of Credit (Details) - 2015 Revolving Line
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
item
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Nov. 07, 2018
USD ($)
Sep. 06, 2017
USD ($)
Sep. 30, 2015
USD ($)
Lines of Credit                
Maximum borrowing capacity             $ 40,000  
Sublimit of loan             1,000  
Additional borrowing capacity             $ 10,000  
Unrestricted cash and unused availability balance $ 3,000   $ 3,000          
Number of trailing months | item     12          
Trailing period         12 months      
Letter of credit outstanding 400   $ 400   $ 400 $ 300   $ 500
Aggregate borrowings outstanding 26,500   26,500          
Amounts available for borrowings $ 13,100   $ 13,100          
Interest rate (as a percent) 5.32% 4.31% 5.32% 4.31%        
Interest expense $ 185 $ 100 $ 252 $ 100        
Deferred financing costs 463   463          
Amortization of deferred financing costs to interest expense $ 25 $ 16 $ 66 $ 40        
Prime Rate                
Lines of Credit                
Floor rate (as a percent)     3.50%          
Minimum                
Lines of Credit                
Minimum EBITDA (as a percent)     75.00%          
Minimum | Prime Rate                
Lines of Credit                
Spread on variable rate (as a percent)     (0.25%)          
Maximum                
Lines of Credit                
Leverage ratio     2.50          
Maximum capital expenditure     $ 5,000          
Maximum | Prime Rate                
Lines of Credit                
Spread on variable rate (as a percent)     0.25%