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Debt - Borrowings (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Principal amount outstanding $ 2,328,410 $ 2,312,092
Less: deferred financing fees (28,789) (30,405)
Net balance sheet carrying amount 2,299,621 2,281,687
Revolving credit facility    
Debt Instrument [Line Items]    
Long-term debt, gross 185,000 155,000
Bank Term Loan - A Facility    
Debt Instrument [Line Items]    
Long-term debt, gross 1,336,500 1,355,062
Senior Notes    
Debt Instrument [Line Items]    
Long-term debt, gross 800,000 800,000
Other    
Debt Instrument [Line Items]    
Long-term debt, gross $ 6,910 $ 2,030