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Debt Long Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 27, 2017
Jun. 24, 2015
Debt Instrument [Line Items]        
Total Debt $ 2,926,083 $ 2,919,185    
Senior Notes | Senior Notes 5.875% due 2022        
Debt Instrument [Line Items]        
Total Debt 1,090,139 1,087,351    
Debt instrument interest rate, percent       5.875%
Debt instrument unamortized discount 9,861 12,649    
Term B Loans Facility | Senior Secured Credit Agreement        
Debt Instrument [Line Items]        
Total Debt $ 188,357 $ 187,725    
Debt instrument interest rate, percent 3.84% 3.84%    
Debt instrument, unamortized discount and debt issuance costs $ 1,268 $ 1,900    
Term C Loan Facility | Senior Secured Credit Agreement        
Debt Instrument [Line Items]        
Total Debt $ 1,647,587 $ 1,644,109 $ 1,761,000  
Debt instrument interest rate, percent 3.85% 3.85%    
Debt instrument unamortized discount     $ 4,000  
Debt instrument, unamortized discount and debt issuance costs $ 18,305 $ 21,783