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Investment Information - Aging of available for sale securities in an unrealized loss position (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months $ 4,844,857 $ 4,280,273
Estimated Fair Value - 12 Months or More 47,077 158,538
Estimated Fair Value 4,891,934 4,438,811
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (90,903) (52,926)
Gross Unrealized Losses - 12 Months or More (3,828) (2,077)
Gross Unrealized Losses (94,731) (55,003)
Fixed maturities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months [1] 4,762,893 4,184,496
Estimated Fair Value - 12 Months or More [1] 47,077 158,538
Estimated Fair Value [1] 4,809,970 4,343,034
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months [1] (89,949) (51,378)
Gross Unrealized Losses - 12 Months or More [1] (3,828) (2,077)
Gross Unrealized Losses [1] (93,777) (53,455)
Fixed maturities | Corporate bonds    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months [1] 1,414,931 675,131
Estimated Fair Value - 12 Months or More [1] 4,169 37,671
Estimated Fair Value [1] 1,419,100 712,802
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months [1] (38,353) (12,350)
Gross Unrealized Losses - 12 Months or More [1] (2,095) (443)
Gross Unrealized Losses [1] (40,448) (12,793)
Fixed maturities | Mortgage backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months [1] 186,860 102,887
Estimated Fair Value - 12 Months or More [1] 690 203
Estimated Fair Value [1] 187,550 103,090
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months [1] (3,262) (927)
Gross Unrealized Losses - 12 Months or More [1] (111) (4)
Gross Unrealized Losses [1] (3,373) (931)
Fixed maturities | Municipal bonds    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months [1] 36,469 220,296
Estimated Fair Value - 12 Months or More [1] 0 0
Estimated Fair Value [1] 36,469 220,296
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months [1] (877) (2,213)
Gross Unrealized Losses - 12 Months or More [1] 0 0
Gross Unrealized Losses [1] (877) (2,213)
Fixed maturities | Commercial mortgage backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months [1] 179,780 147,290
Estimated Fair Value - 12 Months or More [1] 2,850 2,683
Estimated Fair Value [1] 182,630 149,973
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months [1] (4,601) (2,302)
Gross Unrealized Losses - 12 Months or More [1] (59) (28)
Gross Unrealized Losses [1] (4,660) (2,330)
Fixed maturities | US government and government agencies    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months [1] 1,386,590 1,373,127
Estimated Fair Value - 12 Months or More [1] 0 32,058
Estimated Fair Value [1] 1,386,590 1,405,185
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months [1] (4,396) (10,089)
Gross Unrealized Losses - 12 Months or More [1] 0 (45)
Gross Unrealized Losses [1] (4,396) (10,134)
Fixed maturities | Non-US government securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months [1] 921,890 1,224,243
Estimated Fair Value - 12 Months or More [1] 0 37,610
Estimated Fair Value [1] 921,890 1,261,853
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months [1] (18,294) (20,163)
Gross Unrealized Losses - 12 Months or More [1] 0 (167)
Gross Unrealized Losses [1] (18,294) (20,330)
Fixed maturities | Asset backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months [1] 636,373 441,522
Estimated Fair Value - 12 Months or More [1] 39,368 48,313
Estimated Fair Value [1] 675,741 489,835
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months [1] (20,166) (3,334)
Gross Unrealized Losses - 12 Months or More [1] (1,563) (1,390)
Gross Unrealized Losses [1] (21,729) (4,724)
Short-term investments    
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract]    
Estimated Fair Value - Less than 12 Months 81,964 95,777
Estimated Fair Value - 12 Months or More 0 0
Estimated Fair Value 81,964 95,777
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Gross Unrealized Losses - Less than 12 Months (954) (1,548)
Gross Unrealized Losses - 12 Months or More 0 0
Gross Unrealized Losses $ (954) $ (1,548)
[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.”