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Derivative Financial Instruments (Details)
6 Months Ended
Jun. 30, 2015
USD ($)
t
T
MMBTU
Jun. 30, 2015
JPY (¥)
t
T
MMBTU
Jun. 30, 2015
CHF (SFr)
t
T
MMBTU
Jun. 30, 2015
KRW (₩)
t
T
MMBTU
Jun. 30, 2015
MXN
t
T
MMBTU
Jun. 30, 2015
CAD
t
T
MMBTU
Jun. 30, 2015
SGD
t
T
MMBTU
Jun. 30, 2015
GBP (£)
t
T
MMBTU
Jun. 30, 2015
EUR (€)
t
T
MMBTU
Jun. 30, 2015
AUD
t
T
MMBTU
Dec. 31, 2014
USD ($)
t
T
MMBTU
Dec. 31, 2014
JPY (¥)
t
T
MMBTU
Dec. 31, 2014
CHF (SFr)
t
T
MMBTU
Dec. 31, 2014
KRW (₩)
t
T
MMBTU
Dec. 31, 2014
MXN
t
T
MMBTU
Dec. 31, 2014
CAD
t
T
MMBTU
Dec. 31, 2014
SGD
t
T
MMBTU
Dec. 31, 2014
GBP (£)
t
T
MMBTU
Dec. 31, 2014
EUR (€)
t
T
MMBTU
Dec. 31, 2014
AUD
t
T
MMBTU
Derivative financial instruments                                        
Estimated amount of unrealized losses, net of tax, related to interest rate, commodity price and currency rate hedging that will be reclassified from other comprehensive income into earnings $ 5,500,000                                      
Hedge period, low end of the range (in months) 12 months                                      
Hedge period, high end of the range (in months) 24 months                                      
Senior Notes, Due 2020 [Member] | Derivatives in Fair Value Hedging Relationships                                        
Derivative financial instruments                                        
Derivative, Notional Amount $ 0                   $ 75,000,000                  
Senior Notes, Due 2022 [Member] | Derivatives in Fair Value Hedging Relationships                                        
Derivative financial instruments                                        
Derivative, Notional Amount 80,000,000                   125,000,000                  
Term Loan A [Member] | Cash Flow Hedging [Member]                                        
Derivative financial instruments                                        
Derivative, Notional Amount $ 175,000,000                   $ 175,000,000                  
Derivative, Fixed Interest Rate 1.635% 1.635% 1.635% 1.635% 1.635% 1.635% 1.635% 1.635% 1.635% 1.635%                    
Singapore Dollar                                        
Derivative financial instruments                                        
Derivative, Notional Amount | SGD                                 SGD 0      
Designated as Hedging Instrument [Member] | Aluminum                                        
Derivative financial instruments                                        
Commodity units hedged | t 1,857 1,857 1,857 1,857 1,857 1,857 1,857 1,857 1,857 1,857 1,657 1,657 1,657 1,657 1,657 1,657 1,657 1,657 1,657 1,657
Designated as Hedging Instrument [Member] | Copper                                        
Derivative financial instruments                                        
Commodity units hedged | t 727 727 727 727 727 727 727 727 727 727 820 820 820 820 820 820 820 820 820 820
Designated as Hedging Instrument [Member] | Natural Gas                                        
Derivative financial instruments                                        
Commodity units hedged | MMBTU 249,026 249,026 249,026 249,026 249,026 249,026 249,026 249,026 249,026 249,026 347,608 347,608 347,608 347,608 347,608 347,608 347,608 347,608 347,608 347,608
Designated as Hedging Instrument [Member] | Steel                                        
Derivative financial instruments                                        
Commodity units hedged | T 21,739 21,739 21,739 21,739 21,739 21,739 21,739 21,739 21,739 21,739 14,665 14,665 14,665 14,665 14,665 14,665 14,665 14,665 14,665 14,665
Designated as Hedging Instrument [Member] | Canadian Dollar                                        
Derivative financial instruments                                        
Derivative, Notional Amount | CAD           CAD 3,539,030                   CAD 7,984,824        
Designated as Hedging Instrument [Member] | European Euro                                        
Derivative financial instruments                                        
Derivative, Notional Amount | €                 € 41,077,359                   € 89,006,695  
Designated as Hedging Instrument [Member] | South Korean Won                                        
Derivative financial instruments                                        
Derivative, Notional Amount | ₩       ₩ 2,000,626,909                   ₩ 1,964,906,996            
Designated as Hedging Instrument [Member] | Singapore Dollar                                        
Derivative financial instruments                                        
Derivative, Notional Amount | SGD             SGD 3,000,000                   SGD 3,900,000      
Designated as Hedging Instrument [Member] | United States Dollar                                        
Derivative financial instruments                                        
Derivative, Notional Amount $ 13,238,995                   $ 29,228,731                  
Designated as Hedging Instrument [Member] | Japan, Yen                                        
Derivative financial instruments                                        
Derivative, Notional Amount | ¥   ¥ 797,929,390                   ¥ 0                
Designated as Hedging Instrument [Member] | United Kingdom, Pounds                                        
Derivative financial instruments                                        
Derivative, Notional Amount | £               £ 1,302,140                   £ 0    
Designated as Hedging Instrument [Member] | Mexico, Pesos                                        
Derivative financial instruments                                        
Derivative, Notional Amount | MXN         MXN 54,808,843                   MXN 52,674,387          
Not designated as hedging instruments | Canadian Dollar                                        
Derivative financial instruments                                        
Derivative, Notional Amount | CAD           CAD 0                            
Not designated as hedging instruments | European Euro                                        
Derivative financial instruments                                        
Derivative, Notional Amount | €                 € 14,572,213                   € 73,302,332  
Not designated as hedging instruments | United States Dollar                                        
Derivative financial instruments                                        
Derivative, Notional Amount $ 57,890,110                   $ 18,244,912                  
Not designated as hedging instruments | Switzerland, Francs                                        
Derivative financial instruments                                        
Derivative, Notional Amount | SFr     SFr 550,000                   SFr 0              
Not designated as hedging instruments | Australia, Dollars                                        
Derivative financial instruments                                        
Derivative, Notional Amount | AUD                   AUD 0                   AUD 2,482,430
Not designated as hedging instruments | Mexico, Pesos                                        
Derivative financial instruments                                        
Derivative, Notional Amount | MXN         MXN 1,240,000                   MXN 3,151,000