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Lines of Credit and Long-Term Debt - Lines of Credit (Details) - 2015 Revolving Line - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2018
Lines of Credit            
Maximum borrowing capacity $ 60,000   $ 60,000      
Sublimit of loan 1,000   1,000      
Unrestricted cash and unused availability balance 1,500   $ 1,500      
Trailing period     12 months   12 months  
Letter of credit outstanding 300   $ 300      
Aggregate borrowings outstanding 0   0     $ 45,000
Amounts available for borrowings $ 59,700   $ 59,700      
Interest rate (as a percent) 5.58% 5.32% 5.58% 5.32%    
Interest expense $ 0 $ 185 $ 351 $ 252    
Deferred financing costs 643   643      
Amortization of deferred financing costs to interest expense 74 $ 25 $ 183 $ 66    
Aggregate borrowings outstanding during the period $ 0          
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%