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Financial Instruments (Carrying And Estimated Fair Values Of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2011
5.75% Senior Notes [Member]
Dec. 31, 2010
5.75% Senior Notes [Member]
Jul. 21, 2003
5.75% Senior Notes [Member]
Dec. 31, 2011
6.50% Senior Notes [Member]
Dec. 31, 2010
6.50% Senior Notes [Member]
Mar. 25, 2008
6.50% Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Cash and cash equivalents, Carrying Amount $ 156,313 $ 196,556 $ 260,727 $ 149,397            
Cash and cash equivalents, Fair Value 156,313 196,556                
Long-term debt, Carrying Amount         (399,486) (399,143)   (149,962) (149,956)  
Long-term debt, Fair Value         (423,324) (430,464)   (174,576) (158,800)  
Term loan, Carrying Amount (150,000)                  
Term loan, Fair Value (150,000)                  
Receivables credit facility, Carrying Amount (109,000) (109,000)                
Receivables credit facility, Fair Value (109,000) (109,000)                
Capital lease obligation, Carrying Amount (21,832) (22,502)                
Capital lease obligation, Fair Value $ (21,832) $ (22,502)                
Senior notes, stated percentage         5.75% 5.75% 5.75% 6.50% 6.50% 6.50%