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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
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