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Leases - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Mar. 31, 2030
USD ($)
Jun. 30, 2029
USD ($)
Dec. 31, 2023
USD ($)
Feb. 28, 2023
USD ($)
ft²
Feb. 28, 2022
ft²
Sep. 30, 2019
ft²
Lessee, Operating Lease, Description [Abstract]                      
Operating lease right-of-use assets   $ 17,439   $ 17,439       $ 17,605      
Present value of lease liabilities   19,497   19,497              
Lease expense   700 $ 700 2,000 $ 1,700            
Cash outflows from operating activities attributable to operating leases       1,600 $ 1,000            
Corporate Headquarters Lease, New York, New York, September 2019                      
Lessee, Operating Lease, Description [Abstract]                      
Leased area (in square feet) | ft²                     25,212
Corporate Headquarters Lease, New York, New York, September 2019 | Forecast                      
Lessee, Operating Lease, Description [Abstract]                      
Operating lease, base rent per annum             $ 1,600        
Corporate Headquarters Lease, New York, New York, September 2019 | Through fifth lease year                      
Lessee, Operating Lease, Description [Abstract]                      
Operating lease, base rent per annum   1,300   1,300              
Corporate Headquarters Lease, New York, New York, September 2019 | After fifth lease year                      
Lessee, Operating Lease, Description [Abstract]                      
Operating lease, base rent per annum   1,400   1,400              
Corporate Headquarters Lease, New York, New York, February 2023                      
Lessee, Operating Lease, Description [Abstract]                      
Leased area (in square feet) | ft²                 24,099    
Operating lease, base rent per annum                 $ 1,500    
Operating lease right-of-use assets                 12,200    
Present value of lease liabilities                 $ 12,100    
Corporate Headquarters Lease, New York, New York, February 2023 | After fifth lease year                      
Lessee, Operating Lease, Description [Abstract]                      
Operating lease, base rent per annum   $ 1,400   $ 1,400              
Corporate Offices Lease Two, New York, New York, Commencing 2024                      
Lessee, Operating Lease, Description [Abstract]                      
Leased area (in square feet) | ft²                   21,262  
Corporate Offices Lease Two, New York, New York, Commencing 2024 | Forecast                      
Lessee, Operating Lease, Description [Abstract]                      
Operating lease, base rent per annum $ 1,300         $ 1,400          
Operating lease, base rent per annum, first term, period (in years) 5 years