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Debt - Borrowings (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Principal amount outstanding $ 2,207,446 $ 2,312,092
Less: deferred financing fees (27,167) (30,405)
Net balance sheet carrying amount 2,180,279 2,281,687
Revolving credit facility    
Debt Instrument [Line Items]    
Long-term debt, gross 92,000 155,000
Bank Term Loan - A Facility    
Debt Instrument [Line Items]    
Long-term debt, gross 1,308,656 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 $ 6,790 $ 2,030