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Derivative Financial Instruments - Outstanding commodity and currency forward contracts designated as hedging (Details) - Designated as Hedging Instrument | 3 Months Ended | 12 Months Ended |  |
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Mar. 31, 2016 JPY (¥) MMBTU T | Dec. 31, 2015 JPY (¥) MMBTU T | Mar. 31, 2016 KRW (₩) | Mar. 31, 2016 SGD | Mar. 31, 2016 EUR (€) | Dec. 31, 2015 KRW (₩) | Dec. 31, 2015 SGD | Dec. 31, 2015 EUR (€)
Foreign currency exchange contracts | Euro Member Countries, Euro |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Currency units hedged | € |  |  |  |  | € 740,555 |  |  | € 0
Foreign currency exchange contracts | Korea (South), Won |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Currency units hedged | ₩ |  |  | ₩ 706,322,850 |  |  | ₩ 1,533,257,930 |  |
Foreign currency exchange contracts | Singapore, Dollars |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Currency units hedged | SGD |  |  |  | SGD 600,000 |  |  | SGD 1,800,000 |
Foreign currency exchange contracts | Japan, Yen |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Currency units hedged | ¥ | ¥ 81,971,900 | ¥ 245,915,700 |  |  |  |  |  |
Natural Gas | Commodity contracts |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Commodity units hedged, energy | MMBTU | 69,379 | 175,617 |  |  |  |  |  |
Steel | Commodity contracts |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Commodity units hedged, mass | T | 3,789 | 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 energy measure used to calculate payments on a derivative instrument. + 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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