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Investments (Narrative) (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]    
Aggregate market value of investments in unrealized loss position   $ 1,150,395,000
Gross unrealized losses on investments in unrealized loss position   45,952,000
Additional contractual commitments $ 1,342,994,000  
Contractual commitments, investment period expiration date 2026  
Fixed Maturity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Aggregate market value of investments in unrealized loss position $ 2,652,150,000 1,150,395,000
Gross unrealized losses on investments in unrealized loss position 42,574,000 45,952,000
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation 39,132,000 16,792,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation 3,442,000 29,160,000
Available-for-sale securities $ 11,553,817,000 $ 10,643,565,000
Fixed Maturity 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 0.20% 0.20%
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 $ 27,803,000 $ 12,522,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation 1,421,000 5,856,000
Sub-Prime and Alt-A Loans [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross unrealized depreciation 0 $ 0
Private Placement Liquidity Sweep [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities $ 381,679,000