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Property, Plant and Equipment (Tables)
9 Months Ended
Sep. 30, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
The following is a summary of property, plant and equipment at September 30, 2015 and December 31, 2014 (in thousands):
 
Estimated
Useful Lives
in Years
 
September 30,
2015
 
December 31,
2014
Land and land improvements (1)
8-15
 
$
19,949

 
$
21,804

Buildings and improvements
39
 
74,023

 
69,827

Rental machinery and equipment
7
 
890,542

 
763,722

Machinery and equipment - other
7
 
60,753

 
64,648

Furniture, fixtures and computers
5
 
18,081

 
17,915

Automobiles and other vehicles
5
 
48,913

 
37,417

Aircraft
7
 
16,267

 
14,868

Leasehold improvements
7-15, or lease term if shorter
 
7,352

 
6,353

Construction in progress - machinery
 
 
 
 
 
and equipment and buildings
 
104,906

 
114,308

 
 
 
1,240,786

 
1,110,862

Less: Accumulated depreciation
 
 
(597,473
)
 
(530,720
)
Total property, plant and equipment, net
 
 
$
643,313

 
$
580,142

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