Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Components of property, plant and equipment
Property, plant and equipment, net	$ 157,957	$ 159,375
Property Subject to or Available for Operating Lease, Net	452,030	372,551
Operations / Corporate: [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	366,292	360,603
Less accumulated depreciation	(208,335)	(201,228)
Property, plant and equipment, net	157,957	159,375
Railcar Leasing [Member]
Components of property, plant and equipment
Property Subject to or Available for Operating Lease, Gross	474,499	388,060
Property Subject to or Available for Operating Lease, Accumulated Depreciation	22,469	15,509
Property Subject to or Available for Operating Lease, Net	452,030	372,551
Buildings [Member] | Operations / Corporate: [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	156,122	155,937
Machinery and equipment [Member] | Operations / Corporate: [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	188,150	186,844
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	$ 18,685	$ 14,487