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Operating Leases (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Leases [Abstract]      
Operating Leases, Rent Expense $ 33,073 $ 25,328 $ 21,485
Operating Leases, Rent Expense, Contingent Rentals $ 169 $ 142 $ 3