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Investment Information - Maturity profile of available for sale securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Estimated Fair Value:    
Estimated fair value $ 17,998,109 $ 18,717,825
Amortized Cost:    
Amortized cost 17,973,823 18,143,305
Fixed maturities and fixed maturities pledged under securities lending agreements    
Estimated Fair Value:    
Due in one year or less 300,889 348,200 [1]
Due after one year through five years 8,355,255 10,629,959 [1]
Due after five years through 10 years 4,689,155 4,881,564 [1]
Due after 10 years 505,758 482,180 [1]
Single maturity date 13,851,057 16,341,903 [1]
Estimated fair value 17,998,109 18,996,608
Amortized Cost:    
Due in one year or less 299,772 339,951 [1]
Due after one year through five years 8,339,387 10,340,819 [1]
Due after five years through 10 years 4,684,393 4,654,754 [1]
Due after 10 years 493,927 448,139 [1]
Single maturity date 13,817,479 15,783,663 [1]
Amortized cost 17,973,823 18,421,669
Fixed maturities and fixed maturities pledged under securities lending agreements | Mortgage backed securities    
Estimated Fair Value:    
Securities without single maturity date 408,477 630,001 [1]
Estimated fair value 408,477 630,001
Amortized Cost:    
Securities without single maturity date 411,110 626,368 [1]
Amortized cost 411,110 626,368
Fixed maturities and fixed maturities pledged under securities lending agreements | Commercial mortgage backed securities    
Estimated Fair Value:    
Securities without single maturity date 1,046,484 389,900 [1]
Estimated fair value 1,046,484 389,900
Amortized Cost:    
Securities without single maturity date 1,047,867 384,254 [1]
Amortized cost 1,047,867 384,254
Fixed maturities and fixed maturities pledged under securities lending agreements | Asset backed securities    
Estimated Fair Value:    
Securities without single maturity date 2,692,091 1,634,804 [1]
Estimated fair value 2,692,091 1,634,804
Amortized Cost:    
Securities without single maturity date 2,697,367 1,627,384 [1]
Amortized cost $ 2,697,367 $ 1,627,384
[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.