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Other Assets and Accrued Liabilities - Long-Term Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Other Liabilities Disclosure [Abstract]    
Broadband contract acquisition and fulfillment costs $ 10,252 $ 6,107
Prepaid expenses and other 1,398 1,908
Interest rate swaps 0 1,252
Deferred charges and other assets $ 11,650 $ 9,267