Property, Plant, Equiment and Railcars on Lease, net (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Components of property, plant and equipment
Property, plant and equipment, net	$ 176,311	$ 160,787
Operations/ Corporate: [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	407,496	376,004
Less accumulated depreciation	(231,185)	(215,217)
Property, plant and equipment, net	176,311	160,787
Railcar Leasing [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	906,786	695,226
Less accumulated depreciation	(58,069)	(31,911)
Property, plant and equipment, net	848,717	663,315
Buildings [Member] | Operations/ Corporate: [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	167,537	164,087
Machinery and equipment [Member] | Operations/ Corporate: [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	219,488	196,768
Land [Member] | Operations/ Corporate: [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	3,687	3,537
Construction in process [Member] | Operations/ Corporate: [Member]
Components of property, plant and equipment
Property, plant and equipment, gross	$ 16,784	$ 11,612