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Related Party - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related Party Transactions [Abstract]      
Related party revenue earned from commercial agreement with TEGNA $ 0 $ 3,400,000 $ 8,500,000
Commercial agreement with TEGNA effective year 2020