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

12 Months Ended

Dec. 31, 2015

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,
	2015			2014
	(in thousands)
Operations / Corporate:
Buildings	$	167,537		$	164,087
Machinery and equipment	219,488			196,768
Land	3,687			3,537
Construction in process	16,784			11,612
	407,496			376,004
Less accumulated depreciation	(231,185		)	(215,217		)
Property, plant and equipment, net	$	176,311		$	160,787
Railcar Leasing:
Railcars on leases	$	906,786		$	695,226
Less accumulated depreciation	(58,069		)	(31,911		)
Railcars on leases, net	$	848,717		$	663,315

The following table summarizes depreciation expense:

	December 31,
	2015		2014		2013
	(in thousands)
Total depreciation expense	$	45,729	$	34,212	$	27,712
Depreciation expense on leased railcars	$	26,163	$	16,454	$	9,799

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

As of December 31, 2015, future contractual minimum rental revenues required under non-cancellable operating leases for railcars with terms longer than one year are as follows (in thousands):

2016	$	127,655
2017	112,673
2018	99,198
2019	80,841
2020	46,098
2021 and thereafter	57,879
Total	$	524,344