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Debt - Senior Secured Term Loans (Details) - USD ($)
$ in Thousands
Aug. 18, 2017
Sep. 30, 2017
Dec. 31, 2016
Debt      
Current portion of long-term debt   $ 25,000 $ 7,752 [1]
Senior secured term loans      
Debt      
Current portion of long-term debt   25,000 $ 0
Senior secured term loans | Maximum      
Debt      
Percent of excess cash flow 50.00%    
Senior secured term loans | Minimum      
Debt      
Percent of excess cash flow 0.00%    
Term B Loan | Senior secured term loans      
Debt      
Loan amount $ 250,000    
Quarterly payment, as a percent of initial issue amount 2.50%    
Original interest discount $ 2,500    
Debt issuance costs $ 4,900    
Principal balance   250,000  
Current portion of long-term debt   $ 25,000  
Wholly-owned, domestic guarantor subsidiaries | Senior secured term loans | Minimum      
Debt      
Threshold, as a percent of consolidated assets 5.00%    
Threshold, as a percent of consolidated net revenues 5.00%    
Other domestic restricted guarantor subsidiaries | Senior secured term loans | Minimum      
Debt      
Threshold, as a percent of consolidated assets 10.00%    
Threshold, as a percent of consolidated net revenues 10.00%    
LIBOR | Interest rate option one | Senior secured term loans      
Debt      
Variable rate basis LIBOR    
Basis spread on variable rate 4.50%    
LIBOR | Term B Loan | Senior secured term loans      
Debt      
Variable rate basis 3 month LIBOR    
Basis spread on variable rate 4.50%    
Base rate | Interest rate option two | Senior secured term loans      
Debt      
Variable rate basis base rate    
Basis spread on variable rate 3.50%    
[1] Condensed consolidated balance sheet as of December 31, 2016 has been derived from audited consolidated financial statements.