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Basis of Presentation and Summary of Significant Accounting Policies - Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accrued interest $ 144,905 $ 91,592
Payroll-related accruals 63,972 94,501
Other accrued liabilities 201,769 165,247
Total accrued expenses and other current liabilities $ 410,646 $ 351,340