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Derivative Financial Instruments - Outstanding commodity and currency forward contracts not designated as hedging (Details) - Not designated as hedging instruments - Foreign currency exchange contracts - USD ($)	Jun. 30, 2016	Dec. 31, 2015
European Euro
Derivative [Line Items]
Notional amount	$ 8,612,505	$ 20,490,320
United States Dollar
Derivative [Line Items]
Notional amount	2,852,568	17,321,106
Japanese Yen
Derivative [Line Items]
Notional amount	320,074,648	70,518,463
British Pound Sterling
Derivative [Line Items]
Notional amount	0	4,840,238
Singapore Dollar
Derivative [Line Items]
Notional amount	$ 0	$ 500,000

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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Period Type:	instant

X

- 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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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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