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Derivative Instruments (Schedule of Call Options by Counterparty) (Details) - Call Options - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative [Line Items] |  |
Notional amount | $ 40,047,196 | $ 39,420,777
Fair value | 1,355,989 | 205,149
Bank of America |  |
Derivative [Line Items] |  |
Notional amount | 2,680,543 | 6,518,808
Fair value | 80,692 | 6,704
Barclays |  |
Derivative [Line Items] |  |
Notional amount | 5,753,868 | 2,301,414
Fair value | 217,536 | 27,032
Canadian Imperial Bank of Commerce |  |
Derivative [Line Items] |  |
Notional amount | 4,110,525 | 4,856,150
Fair value | 154,917 | 29,313
Citibank, N.A. |  |
Derivative [Line Items] |  |
Notional amount | 4,075,544 | 4,792,208
Fair value | 109,046 | 27,239
Credit Suisse |  |
Derivative [Line Items] |  |
Notional amount | 4,526,414 | 2,877,916
Fair value | 116,659 | 12,887
J.P. Morgan |  |
Derivative [Line Items] |  |
Notional amount | 4,703,234 | 3,701,964
Fair value | 151,651 | 17,564
Morgan Stanley |  |
Derivative [Line Items] |  |
Notional amount | 1,886,995 | 3,560,044
Fair value | 41,253 | 1,561
Royal Bank of Canada |  |
Derivative [Line Items] |  |
Notional amount | 2,565,202 | 1,871,305
Fair value | 101,511 | 14,011
Societe Generale |  |
Derivative [Line Items] |  |
Notional amount | 3,280,286 | 2,343,165
Fair value | 139,101 | 21,681
SunTrust |  |
Derivative [Line Items] |  |
Notional amount | 2,051,229 | 1,755,030
Fair value | 74,910 | 12,047
Wells Fargo |  |
Derivative [Line Items] |  |
Notional amount | 4,221,408 | 4,618,569
Fair value | 163,520 | 33,398
Exchange Traded |  |
Derivative [Line Items] |  |
Notional amount | 191,948 | 224,204
Fair value | $ 5,193 | $ 1,712

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