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Investment Information - Maturity Profile of Available For Sale Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Estimated Fair Value:    
Estimated fair value $ 18,717,825 $ 16,894,526
Amortized Cost:    
Amortized cost 18,143,305 16,598,808
Fixed maturities and fixed maturities pledged under securities lending agreements    
Estimated Fair Value:    
Due in one year or less 348,200 428,659
Due after one year through five years 10,629,959 10,126,403
Due after five years through 10 years 4,881,564 3,317,535
Due after 10 years 482,180 411,269
Single maturity date 16,341,903 14,283,866
Estimated fair value 18,996,608 17,263,036
Amortized Cost:    
Due in one year or less 339,951 423,617
Due after one year through five years 10,340,819 9,996,206
Due after five years through 10 years 4,654,754 3,219,567
Due after 10 years 448,139 388,280
Single maturity date 15,783,663 14,027,670
Amortized cost 18,421,669 16,966,188
Fixed maturities and fixed maturities pledged under securities lending agreements | Mortgage backed securities    
Estimated Fair Value:    
Securities without single maturity date 630,001 562,309
Amortized Cost:    
Securities without single maturity date 626,368 553,571
Amortized cost 626,368 553,571
Fixed maturities and fixed maturities pledged under securities lending agreements | Commercial mortgage backed securities    
Estimated Fair Value:    
Securities without single maturity date 389,900 733,108
Amortized Cost:    
Securities without single maturity date 384,254 720,487
Amortized cost 384,254 720,487
Fixed maturities and fixed maturities pledged under securities lending agreements | Asset backed securities    
Estimated Fair Value:    
Securities without single maturity date 1,634,804 1,683,753
Amortized Cost:    
Securities without single maturity date 1,627,384 1,664,460
Amortized cost $ 1,627,384 $ 1,664,460