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Operating Leases (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2011
Operating Leases  
Term of non-cancellable pick-up leases (in years) 1
Renewal options for non-cancellable pick-up leases, Maximum (in months) 72
Average pick-up lease term, Minimum (in months) 28
Average pick-up lease term, Maximum (in months) 36
Loss on disposal reserve $ 1,066