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Transactions with Affiliates (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
employee
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
employee
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Related Party Transaction [Line Items]            
Advances to affiliate   $ 292,630   $ 292,630   $ 247,869
Related party transaction, rate       0.01%    
Entity number of employees | employee   0   0    
Related party transaction, expenses from transactions with related party   $ 21,500 $ 18,100 $ 61,800 $ 60,900  
Cash distributions to parent       (133,000) (124,000)  
Affiliated Entity [Member]            
Related Party Transaction [Line Items]            
Advances to affiliate   292,600   292,600   $ 247,900
Interest Income, Related Party         600  
Revenue from Related Parties   $ 300 $ 200 900 600  
Cash distributions to parent       $ (133,000) $ (124,000)  
Affiliated Entity [Member] | Subsequent Event [Member]            
Related Party Transaction [Line Items]            
Cash distributions to parent $ (33,500)