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Derivative Instruments - Gain From Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain impact that derivative instruments not designated as hedging instruments had on results of operations	$ 48,875	$ (349,402)
Futures | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain impact that derivative instruments not designated as hedging instruments had on results of operations	72,385	(436,414)
Currency forwards | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain impact that derivative instruments not designated as hedging instruments had on results of operations	(24,173)	85,910
Options | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain impact that derivative instruments not designated as hedging instruments had on results of operations	663	1,102
Foreign exchange - forward contract | Derivative instruments designed as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Net gain from derivative instruments, which are recorded in accumulated other comprehensive income	$ 0	$ 150

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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+ References

No definition available.

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- Definition

Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=109978405&loc=d3e80720-113993

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580

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