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Background and Significant Accounting Policies (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2011
BusinessLine
Dec. 31, 2010
Dec. 31, 2009
Basis Of Presentation And Significant Accounting Policies (Textual) [Abstract]      
Duration of production and processing equipment fabrication project between three and 36 months    
Number of business lines operate 3    
Investments in affiliated entities More than a 20%    
Percentage interest in affiliated entities 20.00%    
Original maturities of Cash equivalents Three months or less    
Significant balances aged Greater than 90 days    
Number of days for evaluating Significant balances 90 days    
Bad debt expense $ 1,610,000 $ 4,750,000 $ 5,929,000
Gain from non-income tax based tax receivables 9,500,000    
Importation penalties 700,000 5,100,000  
Amount of tax recognized upon settlement, Description greater than 50 percent    
Amount of tax recognized upon settlement 50.00%    
Change in fair value of derivative financial instruments (2,126,000) 8,797,000 13,088,000
Net of tax $ 12,100,000 $ 5,600,000 $ 4,800,000
Computer Software, Intangible Asset [Member]
      
Debt Instrument [Line Items]      
Estimated useful life of computer software, minimum 3    
Estimated useful life of computer software, Maximum 5    
On conversion of 4.25% convertible senior notes due 2014 [Member]
      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 4.25%    
On conversion of 4.75% convertible senior notes due 2014 [Member]
      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 4.75%