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Accrued Expenses - Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Payables And Accruals [Abstract]    
Compensation and related taxes $ 44,775 $ 20,713
Network affiliation fees 68,197 30,153
Other 46,309 20,449
Accrued expenses $ 159,281 $ 71,315