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Derivative Instruments - Gain From Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Not designated as hedging instruments
Gain impact of derivative instruments not designated as hedging instruments
Gain impact that derivative instruments not designated as hedging instruments had on results of operations	$ (349,402)	$ 114,210
Derivative instruments designed as hedging instruments:
Gain impact of derivative instruments not designated as hedging instruments
Net gain from derivative instruments, which are recorded in accumulated other comprehensive income	150	0
Futures | Not designated as hedging instruments
Gain impact of derivative instruments not designated as hedging instruments
Gain impact that derivative instruments not designated as hedging instruments had on results of operations	(436,414)	165,590
Currency forwards | Not designated as hedging instruments
Gain impact of derivative instruments not designated as hedging instruments
Gain impact that derivative instruments not designated as hedging instruments had on results of operations	85,910	(51,381)
Options | Not designated as hedging instruments
Gain impact of derivative instruments not designated as hedging instruments
Gain impact that derivative instruments not designated as hedging instruments had on results of operations	$ 1,102	$ 1

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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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.

+ Details

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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