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Leases (Schedule Of Capital Leased Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Leases [Abstract]    
Property, plant and equipment under capital lease arrangements and other capitalized assets relating to leasing activities $ 1,265,758 $ 1,124,185
Accumulated depreciation and amortization (572,111) (522,432)
Net book value $ 693,647 $ 601,753