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Debt (Summary Of Debt) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
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]
Dec. 31, 2011
Receivables Credit Facility [Member]
Dec. 31, 2010
Receivables Credit Facility [Member]
Dec. 31, 2011
Senior Credit Facility [Member]
Debt Instrument [Line Items]                      
Credit facility due $ 109,000 $ 109,000             $ 109,000 $ 109,000 $ 150,000
Senior notes, net of discount     399,486 399,143   149,962 149,956        
Total 808,448 658,099                  
Less current portion 15,000 109,000                  
Total long-term debt 793,448 549,099                  
Credit facility, effective interest rate                 1.15% 1.56% 2.08%
Credit facility, expiration date                 October 11, 2014   October 11, 2016
Discount on senior notes     $ 514 $ 857   $ 38 $ 44        
Senior notes, stated percentage     5.75% 5.75% 5.75% 6.50% 6.50% 6.50%      
Debt instrument maturity     Aug. 01, 2013     Mar. 15, 2018