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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 30, 2020
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Accounting policy disclosures            
Redeemable noncontrolling interests   $ 506,787   $ 506,787   $ 464,359
Capitalized contract cost   82,000 $ 80,000 166,000 $ 168,000  
Amortization expense related to the programs   97,000 108,000 194,000 220,000  
Total costs capitalized   354,000   354,000   $ 381,000
Advertising expenses   165,000 128,000 293,000 278,000  
Research and Development            
Research and development cost   11,000 $ 12,000 22,000 $ 22,000  
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   402,000   402,000    
Northstar Manager LLC            
Redeemable Noncontrolling Interest            
Accrued redeemable non-controlling interest   $ 105,000   $ 105,000    
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