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Variable Interest Entities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]    
Restricted cash and cash equivalents [1] $ 15,836 $ 12,715
Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Restricted cash and cash equivalents $ 13,200 $ 10,100
[1] See “—Note 5 (Insurance Operations)” for a discussion of the nature of the restrictions for restricted cash and cash equivalents and “—Note 14 (Variable Interest Entities)” for a discussion of restricted cash held in a trust account.