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Derivative Instruments (Schedule of Call Options and Interest Rate Swaps by Counterparty) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Derivative [Line Items] |  |
Fair Value | $ 431,727 | $ 1,277,480
Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 39,335,903 | 40,091,353
Fair Value | 430,558 | 1,276,574
Bank of America | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 3,574,125 | 3,556,256
Fair Value | 26,080 | 99,229
Barclays | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 3,686,896 | 4,213,658
Fair Value | 39,657 | 157,865
Canadian Imperial Bank of Commerce | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 2,707,734 | 3,956,329
Fair Value | 34,218 | 141,540
Citibank, N.A. | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 3,748,162 | 3,190,833
Fair Value | 29,873 | 115,860
Credit Suisse | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 2,086,470 | 3,716,868
Fair Value | 20,691 | 113,295
J.P. Morgan | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 6,501,103 | 4,482,832
Fair Value | 69,006 | 105,899
Morgan Stanley | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 2,957,389 | 2,223,743
Fair Value | 38,470 | 47,950
Royal Bank of Canada | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 4,378,132 | 3,567,972
Fair Value | 58,026 | 100,472
Societe Generale | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 2,099,081 | 2,548,072
Fair Value | 17,157 | 86,494
Truist | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 1,960,787 | 2,547,808
Fair Value | 32,885 | 94,924
Wells Fargo | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 5,436,824 | 5,820,381
Fair Value | 61,840 | 206,403
Exchange traded | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional Amount | 199,200 | 266,601
Fair Value | $ 2,655 | $ 6,643

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