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Nature of Operations and Basis of Presentation (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 45 Months Ended
Nov. 22, 2023
USD ($)
mi²
term
Dec. 31, 2023
USD ($)
Nov. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
Jul. 31, 2023
USD ($)
Apr. 30, 2023
mi²
people
city
county
Oct. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Feb. 28, 2021
USD ($)
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
county
Dec. 31, 2022
USD ($)
county
Dec. 31, 2026
USD ($)
Sep. 21, 2023
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Sep. 30, 2021
USD ($)
Conversion of Stock [Line Items]                                      
Prepayments received   $ 107,060   $ 80,265       $ 53,945   $ 107,060 $ 80,265 $ 61,367 $ 107,060 $ 61,367     $ 60,759 $ 54,678  
Broadband licenses granted, number of counties | county                         24 70          
Payments to acquire intangible assets                         $ 14,809 $ 19,069          
Increase in deposit assets                   7,500                  
Spectrum revenues                   1,271   578 2,931 1,311          
Contingent liability   15,000             $ 20,000 15,000     15,000       $ 0    
Stock repurchase program, authorized amount                               $ 250,000     $ 50,000
SDG&E                                      
Conversion of Stock [Line Items]                                      
Consideration transferred                 $ 50,000                    
Tampa Electric Company | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement                                      
Conversion of Stock [Line Items]                                      
Agreement term 20 years                                    
Number of agreement extension terms | term 2                                    
Agreement extension term 10 years                                    
Service area | mi² 2,000                                    
Total scheduled prepayments $ 34,500                                    
Prepayments received   6,900               6,900     6,900            
Lower Colorado River Authority (LCRA) | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement                                      
Conversion of Stock [Line Items]                                      
Initial payment received                   15,000                  
Lower Colorado River Authority (LCRA) | Licensing Agreements                                      
Conversion of Stock [Line Items]                                      
Broadband licenses granted, number of counties | county           68                          
Broadband licenses granted, number of cities | city           30                          
Broadband licenses granted, number of customers | people           100                          
Broadband licenses granted, service area | mi²           73,000                          
Lower Colorado River Authority (LCRA) | Licensing Agreements | Forecast                                      
Conversion of Stock [Line Items]                                      
Payments to acquire intangible assets                             $ 30,000        
Xcel Energy | Spectrum revenue                                      
Conversion of Stock [Line Items]                                      
Spectrum revenues                   663   0 1,107 0          
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement                                      
Conversion of Stock [Line Items]                                      
Agreement term             20 years                        
Total scheduled prepayments             $ 80,000                        
Prepayments received   50,300               50,300   $ 8,000 $ 50,300 $ 8,000          
Milestone payment received     $ 21,200   $ 21,200                            
SDG&E | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement                                      
Conversion of Stock [Line Items]                                      
Milestone payment received   $ 200   $ 25,200       $ 200   $ 200 25,200                
Delivery delay adjustments                     $ 1,100