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Guarantor Subsidiaries Financial Information Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]        
Cash and Cash Equivalents $ 25,058 $ 21,878 $ 287,313 $ 375,736
Trade 408,350 428,328    
Notes Receivable, Related Parties, Current 322,406 318,387    
Other Receivables 153,697 131,131    
Accounts Receivable - Securitized 30,119 37,846    
Inventories 217,034 247,766    
Deferred Income Taxes 160,750 148,104    
Senior Notes Due April 2017 at 8.00%
       
Condensed Financial Statements, Captions [Line Items]        
Debt Instrument, Face Amount 1,500,000      
Interest rate stated percentage 8.00%      
Senior notes due April 2020 at 8.25%
       
Condensed Financial Statements, Captions [Line Items]        
Debt Instrument, Face Amount 1,250,000      
Interest rate stated percentage 8.25%      
Senior notes due March 2021 at 6.375%
       
Condensed Financial Statements, Captions [Line Items]        
Debt Instrument, Face Amount $ 250,000      
Interest rate stated percentage 6.375%