Property, Plant, Equiment and Railcars on Lease, net (Tables)

12 Months Ended

Dec. 31, 2014

Property, Plant and Equipment [Abstract]

Components of property, plant and equipment

The following table summarizes the components of property, plant, equipment and railcars on leases, net:

	December 31,
	2014			2013
	(in thousands)
Operations / Corporate:
Buildings	$	164,087		$	155,937
Machinery and equipment	196,768			186,844
Land	3,537			3,335
Construction in process	11,612			14,487
	376,004			360,603
Less accumulated depreciation	(215,217		)	(201,228		)
Property, plant and equipment, net	$	160,787		$	159,375
Railcar Leasing:
Railcars on leases	$	695,226		$	388,060
Less accumulated depreciation	(31,911		)	(15,509		)
Railcars on leases, net	$	663,315		$	372,551

The following table summarizes depreciation expense:

	December 31,
	2014		2013		2012
	(in thousands)
Total depreciation expense	$	34,212	$	27,712	$	23,850
Depreciation expense on leased railcars	$	16,454	$	9,799	$	4,424

Summary of future contractual minimum rental revenues required under non-cancellable operating leases for railcars

As of December 31, 2014, future contractual minimum rental revenues required under non-cancellable operating leases for railcars with terms longer than one year are as follows (in thousands):

2015	$	96,813
2016	95,096
2017	80,174
2018	66,736
2019	45,782
2020 and thereafter	41,353
Total	$	425,954