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Derivative Instruments (Derivative Call Options, Notional Amount and Fair Value, by Counterparty) (Details) - Call Options [Member] - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Derivative [Line Items]    
Notional amount $ 37,938,945 $ 35,498,003
Derivative instruments 847,243 1,568,380
Bank of America [Member]    
Derivative [Line Items]    
Notional amount 5,761,669 4,645,366
Derivative instruments 97,612 237,955
Barclays [Member]    
Derivative [Line Items]    
Notional amount 3,349,719 4,135,537
Derivative instruments 80,644 154,127
BNP Paribas [Member]    
Derivative [Line Items]    
Notional amount 362,737 1,411,989
Derivative instruments 9,716 73,650
Canadian Imperial Bank of Commerce [Member]    
Derivative [Line Items]    
Notional amount 5,200,796 2,808,030
Derivative instruments 137,773 84,268
Citibank, N.A. [Member]    
Derivative [Line Items]    
Notional amount 5,315,570 4,104,666
Derivative instruments 106,135 219,900
Credit Suisse [Member]    
Derivative [Line Items]    
Notional amount 2,490,747 3,538,855
Derivative instruments 33,531 137,384
J.P. Morgan [Member]    
Derivative [Line Items]    
Notional amount 2,581,684 1,753,649
Derivative instruments 67,932 109,689
Morgan Stanley [Member]    
Derivative [Line Items]    
Notional amount 3,823,069 3,408,179
Derivative instruments 63,045 184,323
Royal Bank of Canada [Member]    
Derivative [Line Items]    
Notional amount 2,663,350 3,027,469
Derivative instruments 79,509 104,141
Societe Generale [Member]    
Derivative [Line Items]    
Notional amount 560,437 0
Derivative instruments 13,521 0
SunTrust [Member]    
Derivative [Line Items]    
Notional amount 1,586,315 2,331,168
Derivative instruments 42,732 90,399
Wells Fargo [Member]    
Derivative [Line Items]    
Notional amount 3,997,795 4,036,255
Derivative instruments 109,827 162,781
Exchange Traded [Member]    
Derivative [Line Items]    
Notional amount 245,057 296,840
Derivative instruments $ 5,266 $ 9,763