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Investments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]    
Additional contractual commitments $ 985,600  
Contractual commitments, investment period expiration date 2026  
Maximum exposure to loss $ 1,700,000 $ 1,700,000
Commitments to fund investments 700,000  
Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Aggregate market value of investments in unrealized loss position 8,904,192 5,882,136
Gross unrealized losses on investments in unrealized loss position 420,315 86,129
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation 336,632 70,899
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation 83,683 15,230
Fixed maturities- available for sale, at fair value $ 12,811,657 $ 12,860,395
Debt Securities [Member] | Sales Revenue Net [Member] | Issuer [Member] | Issuer with the second largest unrealized loss position [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Percentage threshold of unrealized losses not exceeded by any one single issuer 0.60% 0.40%
Debt Securities [Member] | U S Government Debt Securities [Member] | Sales Revenue Net [Member] | Issuer [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Percentage threshold of unrealized losses not exceeded by any one single issuer 2.80% 2.10%
Recorded An Allowance For Credit Losses [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Aggregate market value of investments in unrealized loss position $ 18,569  
Gross unrealized losses on investments in unrealized loss position 791  
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation 791 $ 400
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation  
External Credit Rating Investment Grade [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation 299,700 61,500
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation 77,100 $ 12,300
Private Placement Liquidity Sweep [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturities- available for sale, at fair value $ 502,400