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Derivative Instruments (Schedule of Call Options by Counterparty) (Details) - Call Options [Member] - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Notional amount	$ 31,048,082	$ 29,277,569
Fair value	830,519	337,256
Bank of America [Member]
Derivative [Line Items]
Notional amount	5,958,884	6,257,861
Fair value	178,477	67,662
Barclays [Member]
Derivative [Line Items]
Notional amount	3,441,832	2,463,768
Fair value	89,721	35,273
BNP Paribas [Member]
Derivative [Line Items]
Notional amount	1,199,265	1,520,710
Fair value	19,598	16,944
Citibank, N.A. [Member]
Derivative [Line Items]
Notional amount	4,038,528	3,786,498
Fair value	97,094	23,587
Credit Suisse [Member]
Derivative [Line Items]
Notional amount	2,130,710	1,278,492
Fair value	44,242	12,508
Deutsche Bank [Member]
Derivative [Line Items]
Notional amount	25,935	1,349,002
Fair value	892	10,704
J.P. Morgan [Member]
Derivative [Line Items]
Notional amount	1,785,583	838,982
Fair value	19,645	5,283
Morgan Stanley [Member]
Derivative [Line Items]
Notional amount	2,543,421	3,465,457
Fair value	64,425	33,171
Royal Bank of Canada [Member]
Derivative [Line Items]
Notional amount	3,384,310	2,820,410
Fair value	103,510	48,654
SunTrust [Member]
Derivative [Line Items]
Notional amount	2,375,418	1,308,434
Fair value	72,990	20,028
Wells Fargo [Member]
Derivative [Line Items]
Notional amount	3,850,842	4,187,955
Fair value	130,545	63,442
Exchange Traded [Member]
Derivative [Line Items]
Notional amount	313,354	0
Fair value	$ 9,380	$ 0

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

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ 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=64837297&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=51825145&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=64830801&loc=SL51823488-111719

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