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Long-Term Debt and Credit Facility - First Lien Credit Facility (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Oct. 15, 2015
USD ($)
Aug. 17, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2018
USD ($)
letter
Dec. 31, 2017
USD ($)
Long-term Debt          
Fee on outstanding letters of credit (as a percent)       4.50% 4.50%
Fronting fee for letters of credit (as a percent)       0.125% 0.125%
Number of outstanding letters of credit | letter       1  
Letters of credit outstanding       $ 50  
Interest expense related to amortization of deferred financing costs and discount       1,949 $ 1,947
Accrued interest       $ 5,058 $ 4,296
First Lien Credit Facility          
Long-term Debt          
Maximum net leverage ratio   7.00      
Eurodollar rate | First Lien Credit Facility          
Long-term Debt          
Applicable margin over reference rate (as a percent)       4.50%  
Eurodollar rate | First Lien Credit Facility | Minimum          
Long-term Debt          
Interest rate (as a percent)       1.00%  
Base rate | First Lien Credit Facility          
Long-term Debt          
Applicable margin over reference rate (as a percent)       3.50%  
Term Loan | First Lien Credit Facility          
Long-term Debt          
Maximum borrowing capacity   $ 435,000      
Amount repaid $ 112,500   $ 10,000    
Revolving Credit Facility          
Long-term Debt          
Amount outstanding       $ 0  
Available for borrowing       $ 19,950  
Revolving Credit Facility | Minimum          
Long-term Debt          
Unused commitment fee (as a percent)       0.50% 0.50%
Revolving Credit Facility | Maximum          
Long-term Debt          
Unused commitment fee (as a percent)       0.375% 0.375%
Revolving Credit Facility | First Lien Credit Facility          
Long-term Debt          
Maximum borrowing capacity   $ 40,000      
Amount drawn to trigger net leverage requirement (as a percent)       50.00%