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Derivative Financial Instruments - Outstanding commodity and currency forward contracts not designated as hedging (Details) | Sep. 30, 2016 USD ($) derivative | Sep. 30, 2016 JPY (¥) derivative | Sep. 30, 2016 SGD derivative | Sep. 30, 2016 GBP (£) derivative | Sep. 30, 2016 EUR (€) derivative | Dec. 31, 2015 USD ($) derivative | Dec. 31, 2015 JPY (¥) derivative | Dec. 31, 2015 SGD derivative | Dec. 31, 2015 GBP (£) derivative | Dec. 31, 2015 EUR (€) derivative
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Interest rate swap contracts |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate swaps | derivative | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
European Euro | Not designated as hedging instruments | Foreign currency exchange contracts |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount | € |  |  |  |  | € 0 |  |  |  |  | € 20,490,320
United States Dollar | Not designated as hedging instruments | Foreign currency exchange contracts |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount | $ | $ 170,000 |  |  |  |  | $ 17,321,106 |  |  |  |
Japanese Yen | Not designated as hedging instruments | Foreign currency exchange contracts |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount | ¥ |  | ¥ 0 |  |  |  |  | ¥ 70,518,463 |  |  |
British Pound | Not designated as hedging instruments | Foreign currency exchange contracts |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount | £ |  |  |  | £ 27,284 |  |  |  |  | £ 4,840,238 |
Singapore Dollar | Not designated as hedging instruments | Foreign currency exchange contracts |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount | SGD |  |  | SGD 800,000 |  |  |  |  | SGD 500,000 |  |

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