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Other Assets and Accrued Liabilities - Long-Term Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Other Liabilities Disclosure [Abstract]    
Broadband contract acquisition and fulfillment costs $ 11,189 $ 10,252
Prepaid expenses and other 4,908 1,398
Deferred charges and other assets $ 16,097 $ 11,650