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Nature Of Operations And Significant Accounting Policies (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2010
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Mar. 31, 2012
Zimbabwe [Member]
Dec. 31, 2011
Canadian Operations [Member]
Mar. 31, 2012
Buildings [Member]
Mar. 31, 2012
Processing And Packing Machinery [Member]
Mar. 31, 2012
Transport Equipment [Member]
Mar. 31, 2012
Computer Equipment [Member]
Nature Of Operations And Significant Accounting Policies [Line Items]                    
Number of countries in which entity operates   30                
Dividends received on investments   $ 16,723,000 $ 0 $ 11,983,000            
Investment in deconsolidated subsidiary         0          
Net foreign currency translation loss         7,200,000          
Advances to suppliers, current and non-current   225,000,000 271,400,000              
Valuation allowance amount related to advances to suppliers   74,400,000 74,900,000              
Provision for loss on uncollectible advances to suppliers   11,900,000 18,700,000 18,500,000            
Discontinued interest accrual on advances to suppliers   59,900,000 76,000,000              
Aggregate balance of recoverable value added tax credits   82,000,000 75,000,000              
Valuation allowance on recoverable value added tax credits   25,000,000 22,000,000              
Brazil audit assessment for tax, penalties, and interest on recoverable value added tax credits   26,000,000                
Reduction of Brazil Audit Assessment For Tax, Penalties, And Interest On Recoverable Value Added Tax Credits   20,000,000                
Estimated useful life, minimum (in years)             15 3 3 3
Estimated useful life, maximum (in years)             40 11 10 10
Goodwill, Written off Related to Sale of Business Unit 5,800,000                  
Impairment costs - Property, plant and equipment           5,600,000        
Deferred Income Tax Expense (Benefit)   6,770,000 (1,044,000) 13,755,000            
Foreign currency remeasurement gain (loss)   (2,300,000) 4,400,000 9,300,000            
Foreign currency transaction gain (loss)   4,200,000 1,700,000 4,000,000            
Percentage of revenue earned from processing tobacco owned by customers   5.00%                
Additional income tax expense       $ 3,500,000