Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Income Taxes [Line Items]
Income Taxes Receivable	$ 33,115	$ 10,735
Accounts payable and accrued liabilities	500,335	$ 507,701
CableONE [Member]
Income Taxes [Line Items]
Income Taxes Receivable	21,900
Accounts payable and accrued liabilities	$ 21,900