Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Components of property, plant and equipment
Property, plant and equipment, net	$ 157,328	$ 155,893
Property Subject to or Available for Operating Lease, Net	296,744	220,282
Operations / Corporate: [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	350,138	340,504
Less accumulated depreciation	(192,810)	(184,611)
Property, plant and equipment, net	157,328	155,893
Railcar Leasing [Member]
Components of property, plant and equipment
Property Subject to or Available for Operating Lease, Gross	306,869	225,992
Property Subject to or Available for Operating Lease, Accumulated Depreciation	10,125	5,710
Property Subject to or Available for Operating Lease, Net	296,744	220,282
Buildings [Member] | Operations / Corporate: [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	155,308	151,545
Machinery and equipment [Member] | Operations / Corporate: [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	178,722	173,468
Land [Member] | Operations / Corporate: [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	3,335	3,335
Construction in process [Member] | Operations / Corporate: [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	$ 12,773	$ 12,156