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Derivative Instruments (Derivative Call Options by Counterparty) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Derivative [Line Items]    
Derivative instruments $ 1,617,000 $ 1,207,288
Call Options    
Derivative [Line Items]    
Notional amount 41,614,193 41,547,731
Derivative instruments 1,617,000 1,207,288
Bank of America | Call Options    
Derivative [Line Items]    
Notional amount 5,257,044 5,090,138
Derivative instruments 155,608 101,863
Barclays | Call Options    
Derivative [Line Items]    
Notional amount 1,507,128 1,787,748
Derivative instruments 58,281 60,495
Canadian Imperial Bank of Commerce | Call Options    
Derivative [Line Items]    
Notional amount 1,696,844 1,438,835
Derivative instruments 60,795 48,660
Citibank, N.A. | Call Options    
Derivative [Line Items]    
Notional amount 2,522,575 3,042,872
Derivative instruments 94,411 61,580
Credit Suisse | Call Options    
Derivative [Line Items]    
Notional amount 42,607 378,613
Derivative instruments 1,532 7,130
Goldman Sachs | Call Options    
Derivative [Line Items]    
Notional amount 590,973 250,609
Derivative instruments 13,441 2,958
J.P. Morgan | Call Options    
Derivative [Line Items]    
Notional amount 4,709,373 4,389,528
Derivative instruments 183,431 91,162
Mizuho | Call Options    
Derivative [Line Items]    
Notional amount 10,983,889 10,450,652
Derivative instruments 512,485 358,820
Morgan Stanley | Call Options    
Derivative [Line Items]    
Notional amount 1,008,975 1,459,836
Derivative instruments 44,079 30,590
Royal Bank of Canada | Call Options    
Derivative [Line Items]    
Notional amount 3,502,832 3,752,133
Derivative instruments 140,472 138,639
Societe Generale | Call Options    
Derivative [Line Items]    
Notional amount 3,048,019 3,048,268
Derivative instruments 109,999 86,041
Truist | Call Options    
Derivative [Line Items]    
Notional amount 1,465,739 1,500,167
Derivative instruments 55,459 50,502
UBS AG | Call Options    
Derivative [Line Items]    
Notional amount 2,195,505 1,954,997
Derivative instruments 52,831 51,108
Wells Fargo | Call Options    
Derivative [Line Items]    
Notional amount 3,082,690 2,998,787
Derivative instruments 134,176 117,626
Exchange traded | Call Options    
Derivative [Line Items]    
Notional amount 0 4,548
Derivative instruments $ 0 $ 114