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Investments (Schedule of Fixed Maturity Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost [1] $ 41,852,088   $ 42,304,736      
Fixed maturity securities, available for sale, gross unrealized gains 4,917,555   5,549,754      
Fixed maturity securities, available for sale, gross unrealized losses [2] (96,197)   (250,826)      
Fixed maturity securities, available for sale, allowance for credit losses (14,190) $ (59,698) (64,771) $ (50,186) $ (28,332) $ 0
Fixed maturity securities, available for sale, fair value 46,659,256   47,538,893      
Accrued interest receivable 374,100   377,500      
United States Government Full Faith and Credit            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost [1] 37,274   37,471      
Fixed maturity securities, available for sale, gross unrealized gains 1,626   2,300      
Fixed maturity securities, available for sale, gross unrealized losses [2] (21)   0      
Fixed maturity securities, available for sale, allowance for credit losses 0   0      
Fixed maturity securities, available for sale, fair value 38,879   39,771      
United States Government Sponsored Agencies            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost [1] 1,009,042   995,465      
Fixed maturity securities, available for sale, gross unrealized gains 37,144   44,132      
Fixed maturity securities, available for sale, gross unrealized losses [2] 0   (46)      
Fixed maturity securities, available for sale, allowance for credit losses 0   0      
Fixed maturity securities, available for sale, fair value 1,046,186   1,039,551      
United States Municipalities, States and Territories            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost [1] 3,219,847   3,236,767      
Fixed maturity securities, available for sale, gross unrealized gains 485,025   543,252      
Fixed maturity securities, available for sale, gross unrealized losses [2] (1,300)   (1,044)      
Fixed maturity securities, available for sale, allowance for credit losses (3,347) (2,791) (2,844) 0 0 0
Fixed maturity securities, available for sale, fair value 3,700,225   3,776,131      
Foreign Government Obligations            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost [1] 177,087   177,062      
Fixed maturity securities, available for sale, gross unrealized gains 20,243   25,644      
Fixed maturity securities, available for sale, gross unrealized losses [2] 0   0      
Fixed maturity securities, available for sale, allowance for credit losses 0   0      
Fixed maturity securities, available for sale, fair value 197,330   202,706      
Corporate Securities            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost [1] 27,525,768   26,745,196      
Fixed maturity securities, available for sale, gross unrealized gains 3,957,107   4,507,716      
Fixed maturity securities, available for sale, gross unrealized losses [2] (16,335)   (35,892)      
Fixed maturity securities, available for sale, allowance for credit losses (10,723) (55,715) (60,193) (46,749) (28,332) 0
Fixed maturity securities, available for sale, fair value 31,455,817   31,156,827      
Residential Mortgage Backed Securities            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost [1] 1,106,921   1,399,956      
Fixed maturity securities, available for sale, gross unrealized gains 88,133   117,135      
Fixed maturity securities, available for sale, gross unrealized losses [2] (2,511)   (2,526)      
Fixed maturity securities, available for sale, allowance for credit losses (120) (1,192) (1,734) (777) 0 0
Fixed maturity securities, available for sale, fair value 1,192,423   1,512,831      
Commercial Mortgage Backed Securities            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost [1] 3,977,815   4,119,650      
Fixed maturity securities, available for sale, gross unrealized gains 223,453   206,255      
Fixed maturity securities, available for sale, gross unrealized losses [2] (25,751)   (64,678)      
Fixed maturity securities, available for sale, allowance for credit losses 0 0 0 (2,660) 0 0
Fixed maturity securities, available for sale, fair value 4,175,517   4,261,227      
Other Asset Backed Securities            
Debt Securities, Available-for-sale [Line Items]            
Fixed maturity securities, available for sale, amortized cost [1] 4,798,334   5,593,169      
Fixed maturity securities, available for sale, gross unrealized gains 104,824   103,320      
Fixed maturity securities, available for sale, gross unrealized losses [2] (50,279)   (146,640)      
Fixed maturity securities, available for sale, allowance for credit losses 0 $ 0 0 $ 0 $ 0 $ 0
Fixed maturity securities, available for sale, fair value $ 4,852,879   $ 5,549,849      
[1] Amortized cost excludes accrued interest receivable of $374.1 million and $377.5 million as of June 30, 2021 and December 31, 2020, respectively.
[2] Gross unrealized losses are net of allowance for credit losses.