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Leased Vehicles (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Dec. 31, 2010
Leased Vehicles, Net [Line Items]            
Property Subject to or Available for Operating Lease, Gross $ 2,062,648   $ 1,012,637      
Manufacturing incemtives 277,079   125,681      
Leased Vehicles Accounted For Operating Leases Net Of Manufacturing Incentives 1,785,569 1,526,609 886,956 613,368 468,540 51,515
Accumulated Depreciation On Leased Vehicles Accounted For As Operating Leases 214,926   77,303      
Purchase Accounting Discount on Leased Vehicles 18   162      
Property Subject to or Available for Operating Lease, Net $ 1,570,625   $ 809,491