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Derivative Instruments (Schedule of Call Options by Counterparty) (Details) - Call Options - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
Notional amount $ 39,362,179 $ 40,047,196
Fair value 1,310,954 1,355,989
Bank of America    
Derivative [Line Items]    
Notional amount 2,835,420 2,680,543
Fair value 95,378 80,692
Barclays    
Derivative [Line Items]    
Notional amount 5,710,978 5,753,868
Fair value 277,692 217,536
Canadian Imperial Bank of Commerce    
Derivative [Line Items]    
Notional amount 6,593,815 4,110,525
Fair value 279,053 154,917
Citibank, N.A.    
Derivative [Line Items]    
Notional amount 3,118,979 4,075,544
Fair value 96,757 109,046
Credit Suisse    
Derivative [Line Items]    
Notional amount 4,422,798 4,526,414
Fair value 78,823 116,659
J.P. Morgan    
Derivative [Line Items]    
Notional amount 3,600,636 4,703,234
Fair value 54,762 151,651
Morgan Stanley    
Derivative [Line Items]    
Notional amount 2,856,466 1,886,995
Fair value 62,969 41,253
Royal Bank of Canada    
Derivative [Line Items]    
Notional amount 1,289,699 2,565,202
Fair value 32,753 101,511
Societe Generale    
Derivative [Line Items]    
Notional amount 1,494,904 3,280,286
Fair value 34,394 139,101
Truist    
Derivative [Line Items]    
Notional amount 2,375,124 2,051,229
Fair value 96,573 74,910
Wells Fargo    
Derivative [Line Items]    
Notional amount 4,848,541 4,221,408
Fair value 196,801 163,520
Exchange Traded    
Derivative [Line Items]    
Notional amount 214,819 191,948
Fair value $ 4,999 $ 5,193