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Investment Information - Aging of available for sale securities in an unrealized loss position (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Available for sale securities:    
Estimated Fair Value - Less than 12 Months $ 12,238,683 $ 3,788,763
Gross Unrealized Losses - Less than 12 Months (157,279) (76,067)
Estimated Fair Value - 12 Months or More 297,357 70,404
Gross Unrealized Losses - 12 Months or More (14,265) (3,587)
Estimated Fair Value - Total 12,536,040 3,859,167
Gross Unrealized Losses - Total (171,544) (79,654)
Fixed maturities and fixed maturities pledged under securities lending agreements    
Available for sale securities:    
Estimated Fair Value - Less than 12 Months 11,953,950 3,690,843
Gross Unrealized Losses - Less than 12 Months (156,689) (74,004)
Estimated Fair Value - 12 Months or More 297,357 70,404
Gross Unrealized Losses - 12 Months or More (14,265) (3,587)
Estimated Fair Value - Total 12,251,307 3,761,247
Gross Unrealized Losses - Total (170,954) (77,591)
Fixed maturities and fixed maturities pledged under securities lending agreements | Corporate bonds    
Available for sale securities:    
Estimated Fair Value - Less than 12 Months 3,639,582 747,442 [1]
Gross Unrealized Losses - Less than 12 Months (63,938) (33,086) [1]
Estimated Fair Value - 12 Months or More 98,867 3,934 [1]
Gross Unrealized Losses - 12 Months or More (5,256) (1,302) [1]
Estimated Fair Value - Total 3,738,449 751,376 [1]
Gross Unrealized Losses - Total (69,194) (34,388) [1]
Fixed maturities and fixed maturities pledged under securities lending agreements | Mortgage backed securities    
Available for sale securities:    
Estimated Fair Value - Less than 12 Months 222,176 284,619 [1]
Gross Unrealized Losses - Less than 12 Months (3,545) (4,788) [1]
Estimated Fair Value - 12 Months or More 46,809 3,637 [1]
Gross Unrealized Losses - 12 Months or More (1,865) (240) [1]
Estimated Fair Value - Total 268,985 288,256 [1]
Gross Unrealized Losses - Total (5,410) (5,028) [1]
Fixed maturities and fixed maturities pledged under securities lending agreements | Municipal bonds    
Available for sale securities:    
Estimated Fair Value - Less than 12 Months 26,665 67,937 [1]
Gross Unrealized Losses - Less than 12 Months (385) (3,835) [1]
Estimated Fair Value - 12 Months or More 16,361 0 [1]
Gross Unrealized Losses - 12 Months or More (1,024) 0 [1]
Estimated Fair Value - Total 43,026 67,937 [1]
Gross Unrealized Losses - Total (1,409) (3,835) [1]
Fixed maturities and fixed maturities pledged under securities lending agreements | Commercial mortgage backed securities    
Available for sale securities:    
Estimated Fair Value - Less than 12 Months 675,603 126,624 [1]
Gross Unrealized Losses - Less than 12 Months (2,805) (2,916) [1]
Estimated Fair Value - 12 Months or More 5,908 2,655 [1]
Gross Unrealized Losses - 12 Months or More (312) (38) [1]
Estimated Fair Value - Total 681,511 129,279 [1]
Gross Unrealized Losses - Total (3,117) (2,954) [1]
Fixed maturities and fixed maturities pledged under securities lending agreements | US government and government agencies    
Available for sale securities:    
Estimated Fair Value - Less than 12 Months 4,211,621 1,285,907 [1]
Gross Unrealized Losses - Less than 12 Months (44,180) (12,611) [1]
Estimated Fair Value - 12 Months or More 33,373 0 [1]
Gross Unrealized Losses - 12 Months or More (1,787) 0 [1]
Estimated Fair Value - Total 4,244,994 1,285,907 [1]
Gross Unrealized Losses - Total (45,967) (12,611) [1]
Fixed maturities and fixed maturities pledged under securities lending agreements | Non-US government securities    
Available for sale securities:    
Estimated Fair Value - Less than 12 Months 1,511,301 543,844 [1]
Gross Unrealized Losses - Less than 12 Months (31,983) (7,658) [1]
Estimated Fair Value - 12 Months or More 62,957 2,441 [1]
Gross Unrealized Losses - 12 Months or More (2,766) (402) [1]
Estimated Fair Value - Total 1,574,258 546,285 [1]
Gross Unrealized Losses - Total (34,749) (8,060) [1]
Fixed maturities and fixed maturities pledged under securities lending agreements | Asset backed securities    
Available for sale securities:    
Estimated Fair Value - Less than 12 Months 1,667,002 634,470 [1]
Gross Unrealized Losses - Less than 12 Months (9,853) (9,110) [1]
Estimated Fair Value - 12 Months or More 33,082 57,737 [1]
Gross Unrealized Losses - 12 Months or More (1,255) (1,605) [1]
Estimated Fair Value - Total 1,700,084 692,207 [1]
Gross Unrealized Losses - Total (11,108) (10,715) [1]
Short-term investments    
Available for sale securities:    
Estimated Fair Value - Less than 12 Months 284,733 97,920
Gross Unrealized Losses - Less than 12 Months (590) (2,063)
Estimated Fair Value - 12 Months or More 0 0
Gross Unrealized Losses - 12 Months or More 0 0
Estimated Fair Value - Total 284,733 97,920
Gross Unrealized Losses - Total $ (590) $ (2,063)
[1] In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities pledged. For purposes of this table, the Company has excluded the collateral received under securities lending, at fair value and included the securities pledged under securities lending, at fair value. See “—Securities Lending Agreements.” In 2021, the Company terminated its securities lending program and no longer enters into securities lending agreements with financial institutions.