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Long-Term Debt - Senior Secured Credit Facilities (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Long-Term Debt    
Amount outstanding $ 1,175,989 $ 1,165,865
Term Loan Facility    
Long-Term Debt    
Amount outstanding $ 1,155,241 $ 1,156,345
Secured Debt | Line of Credit | Term Loan Facility    
Long-Term Debt    
Principal payment frequency quarterly quarterly
Quarterly amortization payment $ 3,000 $ 3,000
Prepayment requirement as a percentage of excess cash flow (as a percent) 50.00%  
Interest rate (as a percent) 5.19%  
Amount outstanding $ 1,200,000  
Secured Debt | Line of Credit | Revolving Credit Facility    
Long-Term Debt    
Amount subtracted from aggregate borrowings in determining compliance with the total leverage ratio $ 5,000  
The minimum percentage of the aggregate amount of the revolving lenders revolving commitments 30.00%  
Maximum amount to borrow $ 9,400  
Secured Debt | Revolving Credit Facility | Revolving Credit Facility    
Long-Term Debt    
Line of Credit Facility, Maximum Borrowing Capacity 35,000 35,000
Available borrowings 9,400  
Amount outstanding 0  
Secured Debt | Letters of credit | Senior Secured Credit Facility, Letters of Credit    
Long-Term Debt    
Available borrowings 3,700  
Secured Debt | Letters of credit | Revolving Credit Facility    
Long-Term Debt    
Maximum amount allocated to letters of credit $ 15,000 $ 15,000