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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
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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

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- 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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- 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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