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Property, Plant, Equipment and Railcars on Lease, net
12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, net
Property, Plant, Equipment, and Railcars on Operating Lease, net
The following table summarizes the components of property, plant and equipment, net:
 
 
December 31,
 
2013
 
2012
 
(in thousands)
Operations/Corporate:
 
 
 
Buildings
$
155,937

 
$
151,545

Machinery and equipment
186,844

 
173,468

Land
3,335

 
3,335

Construction in process
14,487

 
12,156

 
360,603

 
340,504

Less accumulated depreciation
(201,228
)
 
(184,611
)
Property, plant and equipment, net
$
159,375

 
$
155,893

Railcar Leasing:
 
 
 
Railcars on Lease
$
388,060

 
$
225,992

Less accumulated depreciation
(15,509
)
 
(5,710
)
Railcars on operating lease, net
$
372,551

 
$
220,282


Capitalized interest
In conjunction with the interest costs incurred related to the senior unsecured notes described in Note 11, the Company capitalized interest on certain property, plant and equipment capital projects.
Lease agreements
The Company leases railcars to third parties under multi-year agreements. Railcars subject to lease agreements are classified as operating leases and are depreciated in accordance with the Company’s depreciation policy.
Capital expenditures for leased railcars represent cash outflows for the Company’s cost to produce railcars shipped or to be shipped for lease.
As of December 31, 2013, future contractual minimum rental revenues required under non-cancellable operating leases for railcars with terms longer than one year are as follows (in thousands): 
2014
$
41,431

2015
40,686

2016
38,968

2017
30,620

2018
19,606

2019 and thereafter
33,561

Total
$
204,872


Depreciation expense
The following table summarizes depreciation expense:
 
December 31,
 
2013
 
2012
 
2011
 
(in thousands)
Total depreciation expense
$
27,712

 
$
23,850

 
$
22,167

Depreciation expense on leased railcars
$
9,799

 
$
4,424

 
$
505