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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 12, 2023
Dec. 30, 2020
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Accounting policy disclosures              
Redeemable noncontrolling interests     $ 529,053   $ 529,053   $ 464,359
Capitalized contract cost     68,000 $ 92,000 234,000 $ 260,000  
Amortization expense related to the programs     92,000 103,000 286,000 323,000  
Total costs capitalized     330,000   330,000   $ 381,000
Advertising expenses     169,000 176,000 462,000 454,000  
Research and Development              
Research and development cost     11,000 $ 12,000 33,000 $ 34,000  
Class B common stock | Northstar Manager LLC              
Variable Interest Entity              
Equity Method Investment, Ownership Percentage   3.00%          
SNR HoldCo              
Accounting policy disclosures              
Value of ownership interest accrued     420,000   420,000    
Northstar Manager LLC              
Redeemable Noncontrolling Interest              
Accrued redeemable non-controlling interest     $ 109,000   109,000    
Northstar Manager LLC | Class B common stock              
Variable Interest Entity              
Ownership percentage   97.00%          
Payment For Purchase Agreement   $ 312,000          
Northstar Manager LLC | American II | Class B common stock              
Variable Interest Entity              
Ownership percentage owned by other companies   80.00%          
Payment For Purchase Agreement   $ 312,000          
5G Network Development              
Accounting policy disclosures              
Purchase of ownership interests         $ 100,000    
Northstar Spectrum | Subsequent event              
Accounting policy disclosures              
Purchase of ownership interests $ 109,000