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Long-term debt (Details)
$ in Thousands
9 Months Ended
Feb. 14, 2017
USD ($)
item
Jul. 31, 2014
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
item
Long-term debt        
Current portion of long-term debt     $ 2,133  
Long-term debt less current portion     $ 205,897 $ 210,270
Maximum period after each fiscal year for prepayment of debt     90 days  
Payment of excess cash flow     $ 0  
Financing costs     1,114  
Maturities of long-term debt        
Remainder of 2017     533  
2018     2,133  
2019     2,133  
2020     2,133  
2021     204,815  
Total maturities     211,747  
Second Amended Term Loan Facility        
Long-term debt        
Long-term Debt     208,030  
Amount of term loan $ 213,300      
Uncommitted accordion option base amount 65,000      
Borrowing capacity $ 30,000      
Amortization payments (in percentage) 1.00%      
OID $ 1,100   2,100  
Accumulated amortization of original issue discount     1,400  
Deferred financing costs     1,600  
Accumulated amortization     2,300  
Second Amended Term Loan Facility | Other expenses        
Long-term debt        
Financing costs     $ 1,400  
Second 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      
Second 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      
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%      
Existing Senior Secured Term Loan B Facility        
Long-term debt        
Long-term Debt       $ 210,270
Amount of term loan   $ 225,000    
Interest rate margin (as a percent)   4.00%    
Uncommitted accordion option multiplier of net leverage ratio | item       2.6
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%  
Existing Senior Secured Term Loan B Facility | First Lien and Total Net Leverage Ratio        
Long-term debt        
Debt caps amount $ 45,000      
Existing Senior Secured Term Loan B Facility | LIBOR        
Long-term debt        
Reference rate basis   LIBOR    
Interest rate margin (as a percent)   4.00%    
Interest rate floor (as a percent)   1.00%    
Existing Senior Secured Term Loan B Facility | LIBOR | Minimum        
Long-term debt        
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%