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Derivative Financial Instruments - Outstanding commodity and currency forward contracts not designated as hedging (Details) - Not designated as hedging instruments	3 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($) t	Dec. 31, 2015 USD ($) t
Aluminum | Commodity contracts
Derivative [Line Items]
Commodity units hedged, mass | t	0	175
Steel | Commodity contracts
Derivative [Line Items]
Commodity units hedged, mass | t	0	3,989
European Euro | Foreign currency exchange contracts
Derivative [Line Items]
Units hedged	$ 13,315,716	$ 20,490,320
United States Dollar | Foreign currency exchange contracts
Derivative [Line Items]
Units hedged	13,150,400	17,321,106
Japan, Yen | Foreign currency exchange contracts
Derivative [Line Items]
Units hedged	0	70,518,463
United Kingdom, Pounds | Foreign currency exchange contracts
Derivative [Line Items]
Units hedged	0	4,840,238
Singapore Dollar | Foreign currency exchange contracts
Derivative [Line Items]
Units hedged	$ 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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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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- Definition

Nominal mass used to calculate payments on a derivative instrument.

+ 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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