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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.

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