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Derivative Instruments (Schedule of Call Options by Counterparty) (Details) - Call Options [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional amount	$ 35,498,003	$ 31,048,082
Fair value	1,568,380	830,519
Bank of America [Member]
Derivative [Line Items]
Notional amount	4,645,366	5,958,884
Fair value	237,955	178,477
Barclays [Member]
Derivative [Line Items]
Notional amount	4,135,537	3,441,832
Fair value	154,127	89,721
BNP Paribas [Member]
Derivative [Line Items]
Notional amount	1,411,989	1,199,265
Fair value	73,650	19,598
Canadian Imperial Bank of Commerce [Member]
Derivative [Line Items]
Notional amount	2,808,030	0
Fair value	84,268	0
Citibank, N.A. [Member]
Derivative [Line Items]
Notional amount	4,104,666	4,038,528
Fair value	219,900	97,094
Credit Suisse [Member]
Derivative [Line Items]
Notional amount	3,538,855	2,130,710
Fair value	137,384	44,242
Deutsche Bank [Member]
Derivative [Line Items]
Notional amount	0	25,935
Fair value	0	892
J.P. Morgan [Member]
Derivative [Line Items]
Notional amount	1,753,649	1,785,583
Fair value	109,689	19,645
Morgan Stanley [Member]
Derivative [Line Items]
Notional amount	3,408,179	2,543,421
Fair value	184,323	64,425
Royal Bank of Canada [Member]
Derivative [Line Items]
Notional amount	3,027,469	3,384,310
Fair value	104,141	103,510
SunTrust [Member]
Derivative [Line Items]
Notional amount	2,331,168	2,375,418
Fair value	90,399	72,990
Wells Fargo [Member]
Derivative [Line Items]
Notional amount	4,036,255	3,850,842
Fair value	162,781	130,545
Exchange Traded [Member]
Derivative [Line Items]
Notional amount	296,840	313,354
Fair value	$ 9,763	$ 9,380

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
-Sentence Column B

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719

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