Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fixed maturities available for sale, at amortized cost	$ 22,614,859	$ 19,708,561
Allowance for credit losses on investments	41,355	2,883
Investments accounted for using the fair value option	1,644,197	1,973,550
Allowance for credit losses on premiums receivable	35,402	39,958
Allowance for credit losses on reinsurance recoverable	21,544	13,230
Allowance for credit loss on contractholder receivable	$ 2,691	$ 3,437
Common shares, par value per share	$ 0.0011	$ 0.0011
Common shares issued (shares)	588,250,762	583,289,850
Common shares held in treasury (shares)	217,904,765	204,365,956
Fixed maturities available for sale, at fair value (amortized cost: $21,281,863 and $17,973,823; net of allowance for credit losses: $41,355 and $2,883)
Fixed maturities available for sale, at amortized cost	$ 21,281,863	$ 17,973,823
Allowance for credit losses on investments	41,355	2,883
Short-term investments available for sale, at fair value (amortized cost: $1,332,996 and $1,734,738; net of allowance for credit losses: $0 and $0 )
Fixed maturities available for sale, at amortized cost	1,332,996	1,734,738
Allowance for credit losses on investments	$ 0	$ 0