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Long-term Debt - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Aggregate outstanding principal $ 8,342,067 $ 6,499,432
Debt Instrument [Line Items]    
Debt issuance costs $ 74,900  
Senior Notes    
Debt Instrument [Line Items]    
Redemption prices, percent of outstanding principal 101.00%