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INTANGIBLE ASSETS AND GOODWILL - Broadcasting Licenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Beginning of period balance $ 2,516,625 $ 2,649,959
Disposition (17,940) (24,901)
Acquisition 19,576 40,131
Loss on impairment 0 (148,564)
Assets held for sale (10,140) 0
Ending period balance $ 2,508,121 $ 2,516,625