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Derivative Instruments (Derivative Call Options and Interest Rate Swaps by Counterparty) (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Derivative [Line Items]    
Derivative instruments $ 1,131,597 $ 431,727 [1]
Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 39,783,069 39,335,903
Derivative instruments 1,131,597 430,558
Bank of America | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 4,124,812 3,574,125
Derivative instruments 81,590 26,080
Barclays | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 2,567,616 3,686,896
Derivative instruments 82,180 39,657
Canadian Imperial Bank of Commerce | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 1,602,801 2,707,734
Derivative instruments 58,359 34,218
Citibank, N.A. | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 4,171,072 3,748,162
Derivative instruments 102,691 29,873
Credit Suisse | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 1,955,159 2,086,470
Derivative instruments 49,252 20,691
J.P. Morgan | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 5,404,600 6,501,103
Derivative instruments 120,638 69,006
Mizuho | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 4,030,827 0
Derivative instruments 145,197 0
Morgan Stanley | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 1,967,830 2,957,389
Derivative instruments 45,622 38,470
Royal Bank of Canada | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 4,479,656 4,378,132
Derivative instruments 146,476 58,026
Societe Generale | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 2,806,536 2,099,081
Derivative instruments 69,333 17,157
Truist | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 2,004,578 1,960,787
Derivative instruments 65,032 32,885
UBS AG | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 300,708 0
Derivative instruments 8,676 0
Wells Fargo | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 4,283,753 5,436,824
Derivative instruments 154,506 61,840
Exchange traded | Call Options and Interest Rate Swaps    
Derivative [Line Items]    
Notional amount 83,121 199,200
Derivative instruments $ 2,045 $ 2,655
[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.