Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES On July 1, 2015 (the Distribution Date), the Company completed the spin-off of Cable ONE as an independent, publicly traded company. The transaction was structured as a tax-free spin-off of Cable ONE to the stockholders of the Company. Since July 1, 2015, Cable One has been an independent public company trading on the New York Stock Exchange under the symbol “CABO”. In connection with the Coronavirus Aid, Relief and Economic Security (CARES) Act, Cable One has the ability to carryback its 2019 taxable losses to the tax period from January 1, 2015 to June 30, 2015, the period in which Cable One was included in the Company’s 2015 tax return. As a result, the Company amended its 2015 tax returns in order to accommodate Cable One's request to carryback its 2019 taxable losses. The Company expects that this action will have no impact on the results or the financial position of the Company. To reflect the expected refund due to Cable One, the Company has included an estimated $15.9 million current income tax receivable and a corresponding current liability to Cable One on its balance sheet as of March 31, 2021. The Company's effective tax rate for the first three months of 2021 was 26.9%. The Company’s effective tax rate for the first three months of 2020 was 57.3%, which was generally based on the Company’s estimated effective tax rate for fiscal year 2020. The Company’s estimated tax rate for 2020 included the adverse impacts of the COVID-19 pandemic and losses on marketable equity securities on the Company’s estimated pre-tax income for 2020, resulting in a significantly higher overall estimated tax rate, as permanent differences and increased valuation allowances have a larger impact on the overall estimated effective tax rate.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.