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Operating Leases (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
M
Y
Operating Leases [Abstract]  
Term of non-cancellable pick-up truck leases (in years) 1
Renewal options for non-cancellable pick-up truck leases, maximum (in months) 72
Average pick-up truck lease term, minimum (in months) 28
Average pick-up truck lease term, maximum (in months) 36
Aggregate residual value guarantee $ 46,629
Loss on disposal reserve $ 576