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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 30, 2020
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Accounting policy disclosures            
Redeemable noncontrolling interests   $ 445,546   $ 445,546   $ 395,222
Capitalized Contract Cost   92,000 $ 98,000 260,000 $ 311,000  
Amortization expense related to the programs   103,000 109,000 323,000 276,000  
Total costs capitalized   395,000   395,000   $ 458,000
Advertising expenses   176,000 156,000 454,000 386,000  
Research and Development            
Research and development cost   12,000 $ 7,000 34,000 $ 21,000  
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   353,000   353,000    
Northstar Manager LLC            
Redeemable Noncontrolling Interest            
Accrued redeemable non-controlling interest   $ 93,000   $ 93,000    
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%