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Valuation And Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance Beginning of Year $ 5,413 $ 6,348 $ 6,862
Charged to Expenses 30,099 26,070 24,189
Deductions (30,478) (27,005) (24,703)
Balance End of Year 5,034 5,413 6,348
Allowance For Doubtful Accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance Beginning of Year 2,493 3,909 4,355
Charged to Expenses 90 (937) 1,506
Deductions (677) [1] (479) [1] (1,952) [1]
Balance End of Year 1,906 2,493 3,909
Reserve For Customer Deductions [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance Beginning of Year 2,920 2,439 2,507
Charged to Expenses 30,009 27,007 22,683
Deductions (29,801) [2] (26,526) [2] (22,751) [2]
Balance End of Year $ 3,128 $ 2,920 $ 2,439
[1] Consists primarily of uncollectable accounts written off, net of recoveries, during the year.
[2] Consists primarily of discounts taken by customers during the year.