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Property, Plant and Equipment
6 Months Ended
Jun. 30, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment

The following is a summary of property, plant and equipment at June 30, 2015 and December 31, 2014 (in thousands):
 
Estimated
Useful Lives
in Years
 
June 30,
2015
 
December 31,
2014
Land and land improvements (1)
8-15
 
$
21,269

 
$
21,804

Buildings and improvements
39
 
72,403

 
69,827

Rental machinery and equipment
7
 
881,249

 
763,722

Machinery and equipment - other
7
 
63,976

 
64,648

Furniture, fixtures and computers
5
 
18,425

 
17,915

Automobiles and other vehicles
5
 
48,006

 
37,417

Aircraft
7
 
14,868

 
14,868

Leasehold improvements
7, or lease term if shorter
 
7,748

 
6,353

Construction in progress - machinery
 
 
 
 
 
and equipment and buildings
 
110,740

 
114,308

 
 
 
1,238,684

 
1,110,862

Less: Accumulated depreciation
 
 
(577,058
)
 
(530,720
)
Total property, plant and equipment, net
 
 
$
661,626

 
$
580,142

 
 
 
(1) The estimated useful life presented is only land improvements. Land does not have a depreciable life.