Segment Information (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 segment ft	Jun. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Number of operating industry segments			1
Number of reportable segments			2
Revenues	$ 55,312,000	$ 52,987,000	$ 109,576,000	$ 103,946,000
Size of containers (in feet)			20
Net book value	1,155,000		1,155,000		1,390,000
Inter-Segment [Member]
Segment Reporting Information [Line Items]
Revenues			0
Railcar Equipment [Member]
Segment Reporting Information [Line Items]
Net book value	$ 78,200,000		$ 78,200,000