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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Debt Instrument [Line Items]    
Total debt $ 2,642,500 $ 2,647,500
Premium on Senior Notes 2026 5,715 6,018
Debt issuance costs (30,509) (32,995)
Total amount outstanding 2,617,706 2,620,523
Less:    
Current portion of long-term debt 10,000 10,000
Non-current portion of long-term debt 2,607,706 2,610,523
Term Loan B    
Debt Instrument [Line Items]    
Total debt 992,500 997,500
Less:    
Current portion of long-term debt 10,000 10,000
Senior Notes | Senior Notes 2026    
Debt Instrument [Line Items]    
Total debt 850,000 850,000
Senior Notes | Senior Notes 2023    
Debt Instrument [Line Items]    
Total debt $ 800,000 $ 800,000