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Derivative Instruments (Schedule of Call Options and Interest Rate Swaps by Counterparty) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Derivative [Line Items]    
Derivative instruments $ 1,207,288 $ 431,727 [1]
Call Options And Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 41,547,731 39,335,903
Derivative instruments 1,207,288 430,558
Bank of America | Call Options And Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 5,090,138 3,574,125
Derivative instruments 101,863 26,080
Barclays | Call Options And Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 1,787,748 3,686,896
Derivative instruments 60,495 39,657
Canadian Imperial Bank of Commerce | Call Options And Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 1,438,835 2,707,734
Derivative instruments 48,660 34,218
Citibank, N.A. | Call Options And Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 3,042,872 3,748,162
Derivative instruments 61,580 29,873
Credit Suisse | Call Options And Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 378,613 2,086,470
Derivative instruments 7,130 20,691
Goldman Sachs | Call Options And Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 250,609 0
Derivative instruments 2,958 0
J.P. Morgan | Call Options And Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 4,389,528 6,501,103
Derivative instruments 91,162 69,006
Mizuho | Call Options And Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 10,450,652 0
Derivative instruments 358,820 0
Morgan Stanley | Call Options And Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 1,459,836 2,957,389
Derivative instruments 30,590 38,470
Royal Bank of Canada | Call Options And Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 3,752,133 4,378,132
Derivative instruments 138,639 58,026
Societe Generale | Call Options And Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 3,048,268 2,099,081
Derivative instruments 86,041 17,157
Truist | Call Options And Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 1,500,167 1,960,787
Derivative instruments 50,502 32,885
UBS AG | Call Options And Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 1,954,997 0
Derivative instruments 51,108 0
Wells Fargo | Call Options And Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 2,998,787 5,436,824
Derivative instruments 117,626 61,840
Exchange traded | Call Options And Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 4,548 199,200
Derivative instruments $ 114 $ 2,655
[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.