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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

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