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Derivative Instruments (Schedule of Call Options by Counterparty) (Details) - Call Options - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Notional amount	$ 39,420,777	$ 35,498,003
Fair value	205,149	1,568,380
Bank of America
Derivative [Line Items]
Notional amount	6,518,808	4,645,366
Fair value	6,704	237,955
Barclays
Derivative [Line Items]
Notional amount	2,301,414	4,135,537
Fair value	27,032	154,127
BNP Paribas
Derivative [Line Items]
Notional amount	0	1,411,989
Fair value	0	73,650
Canadian Imperial Bank of Commerce
Derivative [Line Items]
Notional amount	4,856,150	2,808,030
Fair value	29,313	84,268
Citibank, N.A.
Derivative [Line Items]
Notional amount	4,792,208	4,104,666
Fair value	27,239	219,900
Credit Suisse
Derivative [Line Items]
Notional amount	2,877,916	3,538,855
Fair value	12,887	137,384
J.P. Morgan
Derivative [Line Items]
Notional amount	3,701,964	1,753,649
Fair value	17,564	109,689
Morgan Stanley
Derivative [Line Items]
Notional amount	3,560,044	3,408,179
Fair value	1,561	184,323
Royal Bank of Canada
Derivative [Line Items]
Notional amount	1,871,305	3,027,469
Fair value	14,011	104,141
Societe Generale
Derivative [Line Items]
Notional amount	2,343,165	0
Fair value	21,681	0
SunTrust
Derivative [Line Items]
Notional amount	1,755,030	2,331,168
Fair value	12,047	90,399
Wells Fargo
Derivative [Line Items]
Notional amount	4,618,569	4,036,255
Fair value	33,398	162,781
Exchange Traded
Derivative [Line Items]
Notional amount	224,204	296,840
Fair value	$ 1,712	$ 9,763

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313

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-Section 50
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-Section 50
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