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Long-term debt (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Feb. 14, 2017
USD ($)
item
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
item
Long-term debt      
Less: Current portion   $ (2,134) $ (2,134)
Long-term debt less current portion   202,794 203,957
Maturities of long-term debt      
Remainder of 2019   533  
2020   2,133  
2021   2,133  
2022   2,133  
2023 and thereafter   200,548  
Total maturities   207,480  
Senior Notes due February 2024      
Long-term debt      
Long-term Debt   $ 204,928 $ 206,091
Second Amended Term Loan Facility      
Long-term debt      
Amount of term loan $ 213,300    
Amortization payments (in percentage) 1.00%    
Maximum period after each fiscal year for prepayment of debt   90 days  
First prepayment of debt as a percentage of excess cash flow, if lower leverage ratio is maintained     0.00%
OID   $ 1,500  
Accumulated amortization of original issue discount   2,000  
Deferred financing costs   1,100  
Accumulated amortization   $ 2,200  
Second Amended Term Loan Facility | First Lien and Total Net Leverage Ratio      
Long-term debt      
Debt caps amount $ 60,000    
Second Amended Term Loan Facility | LIBOR      
Long-term debt      
Interest rate margin (as a percent) 3.50%    
Second Amended Term Loan Facility | Alternate Base Rate (ABR)      
Long-term debt      
Interest rate margin (as a percent) 2.50%    
Amended Term Loan Facility      
Long-term debt      
Borrowing capacity $ 30,000    
Amended Term Loan Facility | First Lien Net Leverage Ratio      
Long-term debt      
Number of consecutive fiscal quarters | item 4    
Uncommitted accordion option multiplier of net leverage ratio | item 4.00    
Amended Term Loan Facility | Total Net Leverage Ratio      
Long-term debt      
Number of consecutive fiscal quarters | item 4    
Uncommitted accordion option multiplier of net leverage ratio | item 6.00    
Existing Senior Secured Term Loan B Facility      
Long-term debt      
Uncommitted accordion option base amount $ 65,000    
Uncommitted accordion option multiplier of net leverage ratio | item     2.50
Prepayment of debt as a percentage of excess cash flow   50.00%  
First prepayment of debt as a percentage of excess cash flow, if lower leverage ratio is maintained   25.00%  
Second prepayment of debt as a percentage of excess cash flow, if lower leverage ratio is maintained   0.00%