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Note 5 - Equity Investments - Carrying Value of Equity Method Investments Without Determinable Fair Values (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Nov. 12, 2020 | Oct. 01, 2020
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Cost Method Investment |  | $ 42,330 |  | $ 150,476 |  |  |
Total equity method investments |  | 656,775 |  | 657,305 |  |  |
Equity investments |  | $ 699,105 |  | 807,781 |  |  |
MBI [Member] |  |  |  |  |  |  |
Equity method investments, ownership | [1] | 45.00% |  |  |  |  |
Total equity method investments |  | $ 626,926 | [1] | 630,679 | [1] | $ 630,700 |
Wisper [Member] |  |  |  |  |  |  |
Equity method investments, ownership |  | 40.40% |  |  |  |  |
Total equity method investments |  | $ 29,849 |  | 26,626 |  |  |
Hargray [Member] |  |  |  |  |  |  |
Cost method investments, ownership |  | 15.00% | [2],[3] |  |  |  | 15.00%
Cost Method Investment | [3],[4] |  |  | 113,165 |  |  |
Nextlink [Member] |  |  |  |  |  |  |
Cost Method Investment |  | $ 27,245 |  | 27,245 |  |  |
Nextlink [Member] | Maximum [Member] |  |  |  |  |  |  |
Cost method investments, ownership |  | 10.00% |  |  |  |  |
Other Cost Method Investment [Member] |  |  |  |  |  |  |
Cost Method Investment |  | $ 15,085 |  | $ 10,066 |  |  |
Other Cost Method Investment [Member] | Maximum [Member] |  |  |  |  |  |  |
Cost method investments, ownership |  | 10.00% |  |  |  |  |
[1] | The Company holds a call option to purchase all but not less than all of the remaining equity interests in MBI that the Company does not already own between January 1, 2023 and June 30, 2024. If the call option is not exercised, certain investors in MBI hold a put option to sell (and to cause all members of MBI other than the Company to sell) to the Company all but not less than all of the remaining equity interests in MBI that the Company does not already own between July 1, 2025 and September 30, 2025. The call and put options (collectively referred to as the “MBI Net Option”) are measured at fair value using Monte Carlo simulations that rely on assumptions around MBI’s equity value, MBI’s and the Company’s equity volatility, MBI’s and the Company’s EBITDA volatility, risk adjusted discount rates and the Company’s cost of debt, among others. The final MBI purchase price allocation resulted in $630.7 million being allocated to the MBI equity investment and $19.7 million and $75.5 million being allocated to the call and put options, respectively. The MBI Net Option is remeasured at fair value on a quarterly basis. The carrying value of the MBI Net Option liability was $114.7 million and $73.3 million as of September 30, 2021 and December 31, 2020, respectively, and was included within other noncurrent liabilities in the condensed consolidated balance sheets. Refer to note 10 for further information on the MBI Net Option.
[2] | As a result of the Company’s May 3, 2021 acquisition of the remaining equity interests in Hargray that it did not already own, Hargray’s assets and liabilities were separately reflected within the Company’s consolidated balance sheet as of the acquisition date and the existing cost method investment was eliminated, resulting in a $33.4 million non-cash gain recognized within other income in the condensed consolidated statement of operations and comprehensive income on the acquisition date.
[3] | Upon initial investment, the Company calculated the fair value of Hargray's total enterprise value using a hybrid of both the discounted cash flow method of the income approach and the guideline public company method of the market approach. Significant assumptions used in the valuation include projected revenue growth rates, customer attrition rates, future EBITDA margins, future capital expenditures and an appropriate discount rate. The enterprise value less Hargray's debt and unamortized debt issuance costs was multiplied by Cable One's minority equity interest percentage to determine the Hargray investment's carrying value. The resulting non-cash gain was calculated as the difference between this carrying value and the book value of the Anniston System's net assets, including its proportionate share of the Company's franchise agreement and goodwill assets. The approximately 15% equity interest in Hargray as of December 31, 2020 was on a fully diluted basis.
[4] | As a result of the Company's May 3, 2021 acquisition of the remaining equity interests in Hargray that it did not already own, Hargray’s assets and liabilities were separately reflected within the Company's condensed consolidated balance sheet as of June 30, 2021 and the existing cost method investment was eliminated, resulting in a $33.4 million non-cash gain recognized within other income in the condensed consolidated statement of operations and comprehensive income.

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