Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Components of property, plant and equipment
Property, plant and equipment, net	$ 159,334	$ 159,375
Property Subject to or Available for Operating Lease, Net	548,836	372,551
Operations / Corporate: [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	371,224	360,603
Less accumulated depreciation	(211,890)	(201,228)
Property, plant and equipment, net	159,334	159,375
Railcar Leasing [Member]
Components of property, plant and equipment
Property Subject to or Available for Operating Lease, Gross	575,588	388,060
Property Subject to or Available for Operating Lease, Accumulated Depreciation	26,752	15,509
Property Subject to or Available for Operating Lease, Net	548,836	372,551
Buildings [Member] | Operations / Corporate: [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	162,106	155,937
Machinery and equipment [Member] | Operations / Corporate: [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	192,686	186,844
Land [Member] | Operations / Corporate: [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	3,537	3,335
Construction in process [Member] | Operations / Corporate: [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	$ 12,895	$ 14,487