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Debt (Aggregate Borrowing Information) (Details) (Financial Services [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Line of Credit Facility [Line Items]      
Available credit lines at year-end $ 2,500 $ 2,500 $ 175,000
Unused credit lines at year-end 2,500 2,500 157,000
Maximum amount outstanding at the end of any month 0 75,403 79,422
Average monthly indebtedness $ 0 $ 17,241 $ 44,522
Weighted-average rate at year-end 4.50% 4.50% 4.29%
Maximum [Member]
      
Line of Credit Facility [Line Items]      
Interest Rate During Period   4.50% 4.75%
Minimum [Member]
      
Line of Credit Facility [Line Items]      
Interest Rate During Period   4.25% 0.53%