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Derivative Financial Instruments - Outstanding commodity and currency forward contracts designated as hedging (Details) - Designated Hedging Instruments | 3 Months Ended | 12 Months Ended |  |
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Mar. 31, 2017 USD ($) MMBTU T | Dec. 31, 2016 USD ($) MMBTU T | Mar. 31, 2017 JPY (¥) | Mar. 31, 2017 KRW (₩) | Mar. 31, 2017 SGD | Mar. 31, 2017 EUR (€) | Mar. 31, 2017 AUD | Dec. 31, 2016 JPY (¥) | Dec. 31, 2016 KRW (₩) | Dec. 31, 2016 SGD | Dec. 31, 2016 EUR (€) | Dec. 31, 2016 AUD
Commodity contracts |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Commodity units hedged, energy | MMBTU | 3,579 | 26,807 |  |  |  |  |  |  |  |  |  |
Commodity units hedged, mass | T | 1,945 | 3,190 |  |  |  |  |  |  |  |  |  |
Foreign currency exchange contracts | Australian Dollar |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | AUD |  |  |  |  |  |  | AUD 1,380,374 |  |  |  |  | AUD 611,143
Foreign currency exchange contracts | European Euro |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | € |  |  |  |  |  | € 4,609,005 |  |  |  |  | € 9,834,120 |
Foreign currency exchange contracts | South Korean Won |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | ₩ |  |  |  | ₩ 83,579,000 |  |  |  |  | ₩ 218,408,100 |  |  |
Foreign currency exchange contracts | Singapore Dollar |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | SGD |  |  |  |  | SGD 300,000 |  |  |  |  | SGD 900,000 |  |
Foreign currency exchange contracts | United States Dollar |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | $ | $ 0 | $ 2,311,697 |  |  |  |  |  |  |  |  |  |
Foreign currency exchange contracts | Japanese Yen |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Currency units hedged | ¥ |  |  | ¥ 43,867,400 |  |  |  |  | ¥ 65,502,800 |  |  |  |

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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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