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Note 5 - Equity Investments (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 27 Months Ended
Sep. 06, 2022
Jun. 01, 2022
Apr. 01, 2022
Mar. 24, 2022
Nov. 05, 2021
Oct. 18, 2021
Oct. 01, 2021
May 03, 2021
Nov. 12, 2020
Oct. 01, 2020
May 04, 2020
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Jul. 10, 2020
Payments to Acquire Investments, Total                             $ 25,075 $ (0)    
Gain (Loss) on Disposition of Business                       $ (0)   $ (0) 13,833 (0)    
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain                       0   0 (0) 33,406    
Equity Method Investments                       1,027,837 $ 589,067   1,027,837   $ 1,027,837  
Derivative Liability, Noncurrent                       0 81,627   0   0  
MBI [Member]                                    
Finite-lived Intangible Assets, Basis Difference Between Fair Value and Carrying Value                         186,600          
Other Noncurrent Liabilities [Member]                                    
Derivative Liability, Noncurrent [1]                       35,520 123,620   35,520   35,520  
MBI Net Option [Member] | Other Noncurrent Liabilities [Member]                                    
Derivative Liability, Noncurrent                       $ 35,500 $ 123,600   35,500   35,500  
Hargray [Member]                                    
Business Acquisition, Percentage of Voting Interests Acquired               85.00%   15.00%                
Payments to Acquire Businesses, Gross               $ 2,000,000                    
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination, Total               2,200,000                    
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain               $ 33,400                    
Disposition of the Anniston Exchange [Member]                                    
Gain (Loss) on Disposition of Business                   $ 82,600                
Wisper ISP, LLC [Member]                                    
Equity Method Investment, Ownership Percentage                                   40.40%
Equity Method Investment, Aggregate Cost                                   $ 25,300
Payments to Acquire Equity Method Investments                             $ 10,300   $ 22,200  
Mega Broadband Investments Holdings [Member]                                    
Equity Method Investment, Ownership Percentage                 45.00%                  
Payments to Acquire Equity Method Investments                 $ 574,900                  
Clearwave Fiber [Member]                                    
Equity Method Investment, Ownership Percentage                       58.00% 58.00%   58.00%   58.00%  
Gain (Loss) on Disposition of Business                             $ 22,100      
Percentage of Revenue                         3.00%          
Equity Method Investments, Fair Value Disclosure                       $ 440,000 $ 440,000   $ 440,000   $ 440,000  
MBI [Member]                                    
Equity Method Investment, Ownership Percentage                       45.00% [2] 45.00%   45.00% [2]   45.00% [2]  
Equity Method Investments                 630,700     $ 569,033 [2] $ 557,715 [2]   $ 569,033 [2]   $ 569,033 [2]  
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity                       499,600 508,300   499,600   $ 499,600  
Finite-lived Intangible Assets, Basis Difference Between Fair Value and Carrying Value                         $ 84,000          
Income (Loss) from Equity Method Investments Before Amortization                       6,400   3,800 21,700 6,800    
Amortization, Total                       $ 3,200   $ 4,000 $ 10,300 $ 10,600    
MBI [Member] | Call Option [Member]                                    
Derivative Assets, Noncurrent, Total                 19,700                  
MBI [Member] | Put Option [Member]                                    
Derivative Liability, Noncurrent                 $ 75,500                  
AMG Technology [Member]                                    
Ownership Percentage         17.00%                          
Payments to Acquire Investments, Total         $ 50,000           $ 27,200              
AMG Technology [Member] | Maximum [Member]                                    
Ownership Percentage                     10.00%              
Hargray [Member]                                    
Ownership Percentage                   15.00%                
Point Broadband Holdings [Member]                                    
Ownership Percentage       7.00%                            
Payments to Acquire Investments, Total       $ 5,400     $ 25,000                      
Point Broadband Holdings [Member] | Maximum [Member]                                    
Ownership Percentage             10.00%                      
Tristar Acquisition I Corp [Member]                                    
Payments to Acquire Investments, Total           $ 20,800                        
Tristar Acquisition I Corp [Member] | Maximum [Member]                                    
Ownership Percentage           10.00%                        
MetroNet Systems [Member]                                    
Payments to Acquire Investments, Total     $ 7,000                              
Investment Owned, at Fair Value     $ 7,000                              
MetroNet Systems [Member] | Maximum [Member]                                    
Ownership Percentage     10.00%                              
Visionary Communications [Member]                                    
Payments to Acquire Investments, Total   $ 7,200                                
Visionary Communications [Member] | Maximum [Member]                                    
Ownership Percentage   10.00%                                
Northwest Fiber Holdco [Member]                                    
Payments to Acquire Investments, Total $ 50,000                                  
Northwest Fiber Holdco [Member] | Maximum [Member]                                    
Ownership Percentage 10.00%                                  
[1] Represents the net value of the Company’s call and put options associated with the remaining equity interests in MBI (as defined in note 5), consisting of an asset of $28.9 million and a liability of $61.7 million, respectively, as of June 30, 2022 and a liability of $17.8 million and a liability of $105.8 million, respectively, as of December 31, 2021. Refer to notes 5 and 10 for further information on the MBI Net Option (as defined in note 5).
[2] 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 $32.7 million and $123.6 million as of June 30, 2022 and December 31, 2021, 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.