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Long-term debt (Details)
$ in Thousands
3 Months Ended
Feb. 14, 2017
USD ($)
item
Jul. 31, 2014
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
item
Long-term debt        
Less: Current portion     $ (534) $ (2,133)
Long-term debt less current portion     205,121 205,509
Deferred financing costs     1,500  
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     205,655 $ 207,642
Second Amended Term Loan Facility        
Long-term debt        
Amount of term loan $ 213,300      
Amortization payments (in percentage) 1.00%      
OID     2,000  
Accumulated amortization of original issue discount     1,500  
Accumulated amortization     $ 1,800  
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%