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Investment Information - Maturity profile of available for sale securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Estimated Fair Value:    
Estimated Fair Value $ 16,841,571 $ 16,894,526
Amortized Cost:    
Amortized cost 16,757,086 16,598,808
Fixed maturities    
Estimated Fair Value:    
Due in one year or less 445,134 428,659
Due after one year through five years 9,622,046 10,126,403
Due after five years through 10 years 3,435,903 3,317,535
Due after 10 years 522,246 411,269
Single maturity date 14,025,329 14,283,866
Estimated Fair Value [1] 17,019,013 17,263,036
Amortized Cost:    
Due in one year or less 445,701 423,617
Due after one year through five years 9,558,975 9,996,206
Due after five years through 10 years 3,358,574 3,219,567
Due after 10 years 496,249 388,280
Single maturity date 13,859,499 14,027,670
Amortized cost [1],[2] 16,932,304 16,966,188
Fixed maturities | Mortgage backed securities    
Estimated Fair Value:    
Securities without single maturity date 466,045 562,309
Estimated Fair Value 466,045 562,309
Amortized Cost:    
Securities without single maturity date 456,455 553,571
Amortized cost [2] 456,455 553,571
Fixed maturities | Commercial mortgage backed securities    
Estimated Fair Value:    
Securities without single maturity date 780,358 733,108
Estimated Fair Value 780,358 733,108
Amortized Cost:    
Securities without single maturity date 787,417 720,487
Amortized cost [2] 787,417 720,487
Fixed maturities | Asset backed securities    
Estimated Fair Value:    
Securities without single maturity date 1,747,281 1,683,753
Estimated Fair Value 1,747,281 1,683,753
Amortized Cost:    
Securities without single maturity date 1,828,933 1,664,460
Amortized cost [2] $ 1,828,933 $ 1,664,460
[1]
In securities lending transactions, the Company receives collateral in excess of the fair value of the securities 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]
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.”