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Derivative Financial Instruments - Outstanding commodity and currency forward contracts designated as hedging (Details) - Designated as Hedging Instrument | 9 Months Ended | 12 Months Ended |  |  |
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Sep. 30, 2016 JPY (¥) MMBTU T | Dec. 31, 2015 JPY (¥) MMBTU T | Sep. 30, 2016 KRW (₩) | Sep. 30, 2016 SGD | Sep. 30, 2016 GBP (£) | Sep. 30, 2016 EUR (€) | Sep. 30, 2016 AUD | Dec. 31, 2015 KRW (₩) | Dec. 31, 2015 SGD | Dec. 31, 2015 EUR (€) | Dec. 31, 2015 AUD | Sep. 30, 2015 GBP (£)
Foreign currency exchange contracts | Australian Dollar |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | AUD |  |  |  |  |  |  | AUD 3,598,634 |  |  |  | AUD 0 |
Foreign currency exchange contracts | European Euro |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | € |  |  |  |  |  | € 21,875,317 |  |  |  | € 0 |  |
Foreign currency exchange contracts | South Korean Won |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | ₩ |  |  | ₩ 496,671,700 |  |  |  |  | ₩ 1,533,257,930 |  |  |  |
Foreign currency exchange contracts | Singapore Dollar |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | SGD |  |  |  | SGD 1,800,000 |  |  |  |  | SGD 1,800,000 |  |  |
Foreign currency exchange contracts | British Pound |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | £ |  |  |  |  | £ 191,411 |  |  |  |  |  |  | £ 0
Foreign currency exchange contracts | Japanese Yen |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | ¥ | ¥ 133,928,500 | ¥ 245,915,700 |  |  |  |  |  |  |  |  |  |
Natural Gas | Commodity contracts |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commodity units hedged, energy | MMBTU | 62,875 | 175,617 |  |  |  |  |  |  |  |  |  |
Steel | Commodity contracts |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commodity units hedged, mass | T | 4,585 | 4,811 |  |  |  |  |  |  |  |  |  |

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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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