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Lines of Credit and Long-Term Debt - Lines of Credit (Details) - 2015 Revolving Line
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
item
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Sep. 06, 2017
USD ($)
Lines of Credit        
Maximum borrowing capacity       $ 60,000
Sublimit of loan       $ 1,000
Unrestricted cash and unused availability balance $ 1,500      
Number of trailing months | item 12      
Letter of credit outstanding $ 200      
Aggregate borrowings outstanding 0   $ 0  
Amounts available for borrowings $ 59,800      
Interest rate (as a percent) 5.58% 5.58%    
Interest expense $ 0 $ 351    
Aggregate borrowings outstanding during the period 0      
Deferred financing costs 793      
Amortization of deferred financing costs to interest expense 100 $ 48    
Deferred financing costs $ 166   $ 266  
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%