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Property, Plant and Equipment
12 Months Ended
Dec. 31, 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 December 31, 2015 and 2014 (in thousands):
 
Estimated
 
 
 
 
 
Useful Lives
 
December 31,
 
in Years
 
2015
 
2014
 
 
 
 
 
 
Land and land improvements (1)
8 - 15
 
$
19,408

 
$
21,804

Buildings and improvements
39
 
74,152

 
69,827

Rental machinery and equipment
7
 
898,134

 
763,722

Machinery and equipment - other
7
 
60,250

 
64,648

Furniture, fixtures and computers
5
 
18,240

 
17,915

Automobiles and other vehicles
5
 
48,402

 
37,417

Aircraft
7
 
16,267

 
14,868

Leasehold improvements
7-15, or lease term if shorter
 
7,947

 
6,353

Construction in progress - machinery
 
 
 
 
 
and equipment and buildings
 
102,432

 
114,308

 
 
 
1,245,232

 
1,110,862

Less: Accumulated depreciation
 
 
(620,273
)
 
(530,720
)
Total property, plant and equipment, net
 
 
$
624,959

 
$
580,142

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

Depreciation expense was approximately $107.2 million, $89.4 million and $77.3 million for the years ended December 31, 2015, 2014 and 2013, respectively.