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Long-term debt (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 14, 2017
USD ($)
item
Jul. 31, 2014
Mar. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
item
Long-term debt          
Less: Current portion       $ (1,067) $ (2,133)
Long-term debt less current portion       204,733 205,509
Deferred financing costs       1,400  
Maturities of long-term debt          
2019       2,133  
2020       2,133  
2021       2,133  
2022 and thereafter       202,682  
Total maturities       209,081  
Senior Notes due February 2024          
Long-term debt          
Long-term Debt       205,800 $ 207,642
Second Amended Term Loan Facility          
Long-term debt          
Amount of term loan $ 213,300        
Amortization payments (in percentage) 1.00%        
OID       1,900  
Accumulated amortization of original issue discount       1,600  
Accumulated amortization       $ 1,900  
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%        
Interest rate floor (as a percent) 0.00%        
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          
Debt caps amount $ 45,000        
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         2.95
Maximum period after each fiscal year for prepayment of debt       90 days  
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%  
Payment of excess cash flow     $ 2,100    
Existing Senior Secured Term Loan B Facility | LIBOR          
Long-term debt          
Interest rate margin (as a percent)   4.00%      
Interest rate floor (as a percent)   1.00%      
Existing Senior Secured Term Loan B Facility | Alternate Base Rate (ABR)          
Long-term debt          
Interest rate margin (as a percent)   3.00%