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Other Assets and Accrued Liabilities - Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Other Liabilities Disclosure [Abstract]    
Prepaid maintenance expenses $ 4,630 $ 3,065
Broadband contract acquisition and fulfillment costs 4,082 4,898
Interest rate swaps 0 1,382
Other 1,867 1,801
Prepaid expenses and other $ 10,579 $ 11,146