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Basis of Presentation and Summary of Significant Accounting Policies - Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Accrued interest $ 89,651   $ 85,046
Payroll-related accruals 92,679   105,089
Other accrued liabilities 263,583   207,944
Accrued expenses and other current liabilities $ 445,913 $ 427,539 $ 398,079