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Derivative Financial Instruments - Schedule of outstanding commodity and currency forward contracts (Details) | 12 Months Ended |  |
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Dec. 31, 2015 USD ($) MMBTU T t | Dec. 31, 2014 USD ($) MMBTU T t | Dec. 31, 2015 GBP (£) | Dec. 31, 2015 KRW (₩) | Dec. 31, 2015 MXN | Dec. 31, 2015 SGD | Dec. 31, 2015 CAD | Dec. 31, 2015 EUR (€) | Dec. 31, 2015 JPY (¥) | Dec. 31, 2015 AUD | Dec. 31, 2014 KRW (₩) | Dec. 31, 2014 MXN | Dec. 31, 2014 SGD | Dec. 31, 2014 CAD | Dec. 31, 2014 EUR (€) | Dec. 31, 2014 AUD
Commodity contracts | Designated as Hedging Instrument | Aluminum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity units hedged, mass | 1,040 | 1,657 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts | Designated as Hedging Instrument | Copper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity units hedged, mass | 472 | 820 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts | Designated as Hedging Instrument | Natural Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity units hedged, energy | MMBTU | 291,260 | 347,608 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts | Designated as Hedging Instrument | Steel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity units hedged, mass | T | 11,895 | 14,665 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts | Not Designated as Hedging Instrument | Aluminum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity units hedged, mass | 175 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts | Not Designated as Hedging Instrument | Steel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity units hedged, mass | T | 3,989 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency exchange contracts | Designated as Hedging Instrument | Canadian Dollar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | CAD |  |  |  |  |  |  | CAD 587,556 |  |  |  |  |  |  | CAD 7,984,824 |  |
Foreign currency exchange contracts | Designated as Hedging Instrument | European Euro |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | € |  |  |  |  |  |  |  | € 231,810 |  |  |  |  |  |  | € 89,006,695 |
Foreign currency exchange contracts | Designated as Hedging Instrument | South Korean Won |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | ₩ |  |  |  | ₩ 1,533,257,930 |  |  |  |  |  |  | ₩ 1,964,906,996 |  |  |  |  |
Foreign currency exchange contracts | Designated as Hedging Instrument | Singapore Dollar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | SGD |  |  |  |  |  | SGD 1,800,000 |  |  |  |  |  |  | SGD 3,900,000 |  |  |
Foreign currency exchange contracts | Designated as Hedging Instrument | United States Dollar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | $ |  | $ 29,228,731 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency exchange contracts | Designated as Hedging Instrument | Mexican Peso |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | MXN |  |  |  |  | MXN 28,504,800 |  |  |  |  |  |  | MXN 52,674,387 |  |  |  |
Foreign currency exchange contracts | Designated as Hedging Instrument | Japanese Yen |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | ¥ |  |  |  |  |  |  |  |  | ¥ 245,915,700 |  |  |  |  |  |  |
Foreign currency exchange contracts | Designated as Hedging Instrument | Great British Pound |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | £ |  |  | £ 113,115 |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency exchange contracts | Not Designated as Hedging Instrument | Canadian Dollar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | CAD |  |  |  |  |  |  | CAD 1,117,850 |  |  |  |  |  |  | CAD 2,516 |  |
Foreign currency exchange contracts | Not Designated as Hedging Instrument | European Euro |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | € |  |  |  |  |  |  |  | € 20,490,320 |  |  |  |  |  |  | € 73,302,332 |
Foreign currency exchange contracts | Not Designated as Hedging Instrument | Singapore Dollar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | SGD |  |  |  |  |  | SGD 500,000 |  |  |  |  |  |  |  |  |  |
Foreign currency exchange contracts | Not Designated as Hedging Instrument | United States Dollar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | $ | $ 17,321,106 | $ 18,244,912 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency exchange contracts | Not Designated as Hedging Instrument | Mexican Peso |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | MXN |  |  |  |  | MXN 0 |  |  |  |  |  |  | MXN 3,151,000 |  |  |  |
Foreign currency exchange contracts | Not Designated as Hedging Instrument | Japanese Yen |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | ¥ |  |  |  |  |  |  |  |  | ¥ 70,518,463 |  |  |  |  |  |  |
Foreign currency exchange contracts | Not Designated as Hedging Instrument | Great British Pound |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | £ |  |  | £ 4,840,238 |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency exchange contracts | Not Designated as Hedging Instrument | Australian Dollar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | AUD |  |  |  |  |  |  |  |  |  | AUD 0 |  |  |  |  |  | AUD 2,482,430

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