Annual report pursuant to Section 13 and 15(d)

Commitments And Contingencies (Schedule Of Rent Expense) (Details)

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Commitments And Contingencies (Schedule Of Rent Expense) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Loss Contingencies [Line Items]      
Rent expense $ 48,298 $ 41,249 $ 32,605
Cost Of Sales [Member]
      
Loss Contingencies [Line Items]      
Rent expense 1,429 1,351 1,465
Selling, General And Administrative Expense [Member]
      
Loss Contingencies [Line Items]      
Rent expense $ 46,869 $ 39,898 $ 31,140