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Derivative Instruments (Derivative Call Options and Interest Rate Swaps by Counterparty) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Derivative [Line Items] |  |  |
Derivative instruments | $ 684,033 | $ 431,727 | [1]
Call Options and Interest Rate Swaps |  |  |
Derivative [Line Items] |  |  |
Notional amount | 39,414,367 | 39,335,903 |
Derivative instruments | 684,033 | 430,558 |
Bank of America | Call Options and Interest Rate Swaps |  |  |
Derivative [Line Items] |  |  |
Notional amount | 3,913,403 | 3,574,125 |
Derivative instruments | 45,365 | 26,080 |
Barclays | Call Options and Interest Rate Swaps |  |  |
Derivative [Line Items] |  |  |
Notional amount | 2,910,246 | 3,686,896 |
Derivative instruments | 60,478 | 39,657 |
Canadian Imperial Bank of Commerce | Call Options and Interest Rate Swaps |  |  |
Derivative [Line Items] |  |  |
Notional amount | 2,442,141 | 2,707,734 |
Derivative instruments | 54,020 | 34,218 |
Citibank, N.A. | Call Options and Interest Rate Swaps |  |  |
Derivative [Line Items] |  |  |
Notional amount | 4,132,309 | 3,748,162 |
Derivative instruments | 49,853 | 29,873 |
Credit Suisse | Call Options and Interest Rate Swaps |  |  |
Derivative [Line Items] |  |  |
Notional amount | 2,074,458 | 2,086,470 |
Derivative instruments | 36,903 | 20,691 |
J.P. Morgan | Call Options and Interest Rate Swaps |  |  |
Derivative [Line Items] |  |  |
Notional amount | 6,153,747 | 6,501,103 |
Derivative instruments | 78,007 | 69,006 |
Mizuho | Call Options and Interest Rate Swaps |  |  |
Derivative [Line Items] |  |  |
Notional amount | 691,141 | 0 |
Derivative instruments | 19,273 | 0 |
Morgan Stanley | Call Options and Interest Rate Swaps |  |  |
Derivative [Line Items] |  |  |
Notional amount | 2,569,596 | 2,957,389 |
Derivative instruments | 36,543 | 38,470 |
Royal Bank of Canada | Call Options and Interest Rate Swaps |  |  |
Derivative [Line Items] |  |  |
Notional amount | 4,595,241 | 4,378,132 |
Derivative instruments | 102,189 | 58,026 |
Societe Generale | Call Options and Interest Rate Swaps |  |  |
Derivative [Line Items] |  |  |
Notional amount | 2,460,528 | 2,099,081 |
Derivative instruments | 36,410 | 17,157 |
Truist | Call Options and Interest Rate Swaps |  |  |
Derivative [Line Items] |  |  |
Notional amount | 2,142,918 | 1,960,787 |
Derivative instruments | 49,287 | 32,885 |
Wells Fargo | Call Options and Interest Rate Swaps |  |  |
Derivative [Line Items] |  |  |
Notional amount | 5,200,545 | 5,436,824 |
Derivative instruments | 113,323 | 61,840 |
Exchange traded | Call Options and Interest Rate Swaps |  |  |
Derivative [Line Items] |  |  |
Notional amount | 128,094 | 199,200 |
Derivative instruments | $ 2,382 | $ 2,655 |
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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