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Segment Information (Narrative) (Details) (USD $)	9 Months Ended
Segment Information (Narrative) (Details) (USD $)	Sep. 30, 2013 ft segment	Dec. 31, 2012
Segment Reporting Information [Line Items]
Number of operating industry segments	1
Number of reportable segments	2
Inter-segment revenues	$ 0
Size of containers (in feet)	20
Net book value	1,535,000	1,847,000
Railcar Equipment [Member]
Segment Reporting Information [Line Items]
Net book value	$ 57,100,000

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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