Property, Plant, Equiment and Railcars on Lease, net (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Components of property, plant and equipment
Property, plant and equipment, net	$ 160,787	$ 159,375
Operations/ Corporate: [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	376,004	360,603
Less accumulated depreciation	(215,217)	(201,228)
Property, plant and equipment, net	160,787	159,375
Railcar Leasing [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	695,226	388,060
Less accumulated depreciation	(31,911)	(15,509)
Property, plant and equipment, net	663,315	372,551
Buildings [Member] | Operations/ Corporate: [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	164,087	155,937
Machinery and equipment [Member] | Operations/ Corporate: [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	196,768	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	$ 11,612	$ 14,487