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Derivative Instruments (Derivative Call Options, Notional Amount and Fair Value, by Counterparty) (Details) - Call Options [Member] - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional amount	$ 33,259,347	$ 31,048,082
Derivative instruments	1,086,624	830,519
Bank of America [Member]
Derivative [Line Items]
Notional amount	5,020,592	5,958,884
Derivative instruments	179,048	178,477
Barclays [Member]
Derivative [Line Items]
Notional amount	3,760,675	3,441,832
Derivative instruments	103,317	89,721
BNP Paribas [Member]
Derivative [Line Items]
Notional amount	1,837,242	1,199,265
Derivative instruments	48,330	19,598
Citibank, N.A. [Member]
Derivative [Line Items]
Notional amount	3,791,993	4,038,528
Derivative instruments	155,815	97,094
Credit Suisse [Member]
Derivative [Line Items]
Notional amount	3,721,586	2,130,710
Derivative instruments	92,577	44,242
Deutsche Bank [Member]
Derivative [Line Items]
Notional amount	0	25,935
Derivative instruments	0	892
J.P. Morgan [Member]
Derivative [Line Items]
Notional amount	1,622,559	1,785,583
Derivative instruments	53,359	19,645
Morgan Stanley [Member]
Derivative [Line Items]
Notional amount	2,795,503	2,543,421
Derivative instruments	104,024	64,425
Royal Bank of Canada [Member]
Derivative [Line Items]
Notional amount	3,167,888	3,384,310
Derivative instruments	104,644	103,510
SunTrust [Member]
Derivative [Line Items]
Notional amount	3,147,079	2,375,418
Derivative instruments	101,690	72,990
Wells Fargo [Member]
Derivative [Line Items]
Notional amount	3,986,928	3,850,842
Derivative instruments	131,676	130,545
Exchange Traded [Member]
Derivative [Line Items]
Notional amount	407,302	313,354
Derivative instruments	$ 12,144	$ 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

+ Details

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X

- 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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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