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Real Estate Sales and Assets Held For Sale Assets Held for Sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Total assets held for sale [1] $ 0 $ 38,900
FCC licenses    
Total assets held for sale $ 0 $ 38,900
[1] (4)See Note 4 for information regarding assets held for sale.