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Investment Information - Summary of Available for Sale Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Available for sale securities:    
Estimated Fair Value $ 20,921,530 $ 18,219,582
Gross Unrealized Gains 657,620 351,114
Gross Unrealized Losses (79,654) (55,003)
Cost or Amortized Cost 18,143,305 16,598,808
Short-term investments available for sale, at amortized cost 1,924,292 957,283
Available for Sale Investments Cost Or Amortized Cost Fixed Maturities And Short Term 20,345,961 17,923,471
Fixed maturities and fixed maturities pledged under securities lending agreements    
Available for sale securities:    
Estimated Fair Value 18,996,608 17,263,036
Gross Unrealized Gains 654,927 350,303
Gross Unrealized Losses (77,591) (53,455)
Allowance for Expected Credit Losses (2,397) 0
Cost or Amortized Cost 18,421,669 16,966,188
Fixed maturities and fixed maturities pledged under securities lending agreements | Corporate bonds    
Available for sale securities:    
Estimated Fair Value 7,856,571 6,406,591
Gross Unrealized Gains [1] 414,247 191,889
Gross Unrealized Losses [1] (34,388) (12,793)
Allowance for Expected Credit Losses [2] (896)  
Cost or Amortized Cost 7,477,608 6,227,495
Fixed maturities and fixed maturities pledged under securities lending agreements | Mortgage backed securities    
Available for sale securities:    
Estimated Fair Value 630,001 562,309
Gross Unrealized Gains [1] 8,939 9,669
Gross Unrealized Losses [1] (5,028) (931)
Allowance for Expected Credit Losses [2] (278)  
Cost or Amortized Cost 626,368 553,571
Fixed maturities and fixed maturities pledged under securities lending agreements | Municipal bonds    
Available for sale securities:    
Estimated Fair Value 494,522 881,926
Gross Unrealized Gains [1] 27,291 24,628
Gross Unrealized Losses [1] (3,835) (2,213)
Allowance for Expected Credit Losses (11) [2] 0
Cost or Amortized Cost 471,077 859,511
Fixed maturities and fixed maturities pledged under securities lending agreements | Commercial mortgage backed securities    
Available for sale securities:    
Estimated Fair Value 389,900 733,108
Gross Unrealized Gains [1] 8,722 14,951
Gross Unrealized Losses [1] (2,954) (2,330)
Allowance for Expected Credit Losses [2] (122)  
Cost or Amortized Cost 384,254 720,487
Fixed maturities and fixed maturities pledged under securities lending agreements | US government and government agencies    
Available for sale securities:    
Estimated Fair Value 5,557,077 4,916,592
Gross Unrealized Gains [1] 22,612 36,600
Gross Unrealized Losses [1] (12,611) (10,134)
Allowance for Expected Credit Losses [2] 0  
Cost or Amortized Cost 5,547,076 4,890,126
Fixed maturities and fixed maturities pledged under securities lending agreements | Non-US government securities    
Available for sale securities:    
Estimated Fair Value 2,433,733 2,078,757
Gross Unrealized Gains [1] 153,891 48,549
Gross Unrealized Losses [1] (8,060) (20,330)
Allowance for Expected Credit Losses [2] 0  
Cost or Amortized Cost 2,287,902 2,050,538
Fixed maturities and fixed maturities pledged under securities lending agreements | Asset backed securities    
Available for sale securities:    
Estimated Fair Value 1,634,804 1,683,753
Gross Unrealized Gains [1] 19,225 24,017
Gross Unrealized Losses [1] (10,715) (4,724)
Allowance for Expected Credit Losses [2] (1,090)  
Cost or Amortized Cost 1,627,384 1,664,460
Short-term investments    
Available for sale securities:    
Estimated Fair Value 1,924,922 956,546
Gross Unrealized Gains 2,693 811
Gross Unrealized Losses (2,063) (1,548)
Allowance for Expected Credit Losses 0  
Short-term investments available for sale, at amortized cost $ 1,924,292 $ 957,283
[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.”
[2] Effective January 1, 2020, the Company adopted ASU 2016-13 and as a result any credit impairment losses on the Company’s available-for-sale investments are recorded as an allowance, subject to reversal.