Operating Leases (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 years months
Operating Leases [Abstract]
Initial lease term of certain distribution centers and manufacturing and store locations, minimum (in months)	1
Initial lease term of certain distribution centers and manufacturing and store locations, maximum (in months)	60
Initial lease terms of most store locations, minimum (in months)	36
Initial lease terms of most store locations, maximum (in months)	48
Leasehold improvements, net book value	$ 2,377
Amortization period of leasehold improvements on operating leases (in months)	36
Terms of semi-tractor leases (in months)	36
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
Aggregate residual value guarantee	44,948
Loss on disposal reserve	$ 743