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Leased Vehicles (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Leased Vehicles, Net [Line Items]            
Property Subject to or Available for Operating Lease, Gross $ 1,758,741   $ 1,012,637      
Manufacturing incemtives (232,132)   (125,681)      
Leased Vehicles Accounted For Operating Leases Net Of Manufacturing Incentives 1,526,609 1,210,434 886,956 468,540 331,596 51,515
Accumulated Depreciation On Leased Vehicles Accounted For As Operating Leases (159,776)   (77,303)      
Purchase Accounting Discount on Leased Vehicles (48)   (162)      
Property Subject to or Available for Operating Lease, Net $ 1,366,785   $ 809,491