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DEBT - Cequel Credit Facilities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Line of Credit Facility [Line Items]          
Loss on extinguishment of debt and write-off of deferred financing costs $ 51,712 $ 0 $ 51,712 $ 0  
Principal amount $ 27,158,633   $ 27,158,633   $ 26,940,911