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Leases (Rental Expense For Operating Leases) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Leases [Abstract]      
Minimum rentals $ 118,810 $ 118,838 $ 103,925
Sublease rentals (2,395) (1,526) (4,681)
Total rental expense for operating leases $ 116,415 $ 117,312 $ 99,244