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, 2012
Dec. 31, 2011
Dec. 31, 2010
Loss Contingencies [Line Items]      
Rent expense $ 53,381 $ 48,298 $ 41,249
Selling, General and Administrative Expense [Member]
     
Loss Contingencies [Line Items]      
Rent expense 51,853 46,869 39,898
Cost of Sales [Member]
     
Loss Contingencies [Line Items]      
Rent expense $ 1,528 $ 1,429 $ 1,351